To swing your knife, you press y. That'll do, but it isn't very fast. To swing your knife twice in rapid succession, pull your gun out, and then quickly tap Y twice. It should pull your knife out and swing it twice very fast.
First you have to pick the support class. Then pull out the repair tool and hop into a hummer. Find a safe place to flip the hummer. Once the hummer is flipped Hit Y until you are in the back seat. Look at one of the side of the hummer and start to repair since the hummer is flipped it will keep taking damage and you can build up your IRA
If you want to unlock the achievement that asks you to climb to the highest point of the whole game, just try this:
In the mission where your helicopter crashes to the ground, you're on your own. Your company mates are taken prisoner. At the end of the mission, you'll find them back in the tower of a church on the highest mountain. Simply climb this tower to the top (just use the stairs, yes it really is this easy) and there you go!
Assault Rifle - Register your old Battlefield games at http://www.veteran.battlefield.com/
Light Machine Gun - Sign up for the newsletter at http://www.findallfive.com/
Semi-Automatic Shotgun - After playing an Online game login and check your stats at http://www.findallfive.com/
Sniper Rifle - Pre-Order the game from a participating retailer before June 23rd, 2008.
Uzi - Play the "Battlefield: Bad Company Demo" and get to rank 4. (2300 EXP required to reach rank 4.)
When choosing a sniper rifle for long range don't choose the M95. It is slower then the Gol M24 and the other rifles. If you're a good sniper you'll get a headshot, so the gun's power doesn't matter - only speed and accuracy.
p.s. If the target is at full health a shot in the stomach won't kill them no matter what sniper you use. If they're damaged, Then a Gol and ect. will finish them off.
If your trying to build up your dog tags the best way to do so is to be a sniper. Find a flag with a lot of place to hide and pull out your radar ball. Once you capture the flag get just out of range so u can no longer hold the flag. As soon as you see it start to be taken throw the radar and go get a new tag.
In the levels of the game, or online too, when you enter a house/cottage/building with a solid roof, look for a staircase somewhere around the place. climb up it and you'll enter the attic area. Try to find a wall with a recessed corner with a window in it, as this would be the weakest wall. move as far away from it as you can, whilst staying in the attic. Throw a grenade towards the area. you should blow a large hole in the wall. These holes offer great shooting positions, and defencive structures from ground troops. The only things to watch out for are, airstrikes, rockets from ground troops, and people also in the building (friendly fire/assassination etc.)
Action, not words! (25) - Complete 'Welcome To Bad Company' on hard
Always get paid in gold bars (15) - Complete 'Welcome To Bad Company' on normal
Be the best (20) - (Online) Place #1 in a ranked match
Beans Bullets Bandages (30) - (Online) Get 10002 kills
Been There, Drove That! (20) - Drive all vehicle types (Jeep, Tank, Heli, Boat)
Capitalist pigs, very nice (25) - Complete 'Crash and Grab' on hard
Cart Wheels (25) - Complete 'Par for the Course' on hard
Catch The 'Bad' Moment (15) - (Online) Take 3 pictures using the image system
Check My Grill (20) - Find half of the gold bars
Clean sweep (25) - Find all collectables
Colonel (25) - (Online) Reach Rank 20
Darwin's Parachute (10) - (Online) Glide in the parachute for 3 seconds
Death From Above (20) - Kill 25 enemies in a helicopter
Dog owner! (20) - (Online) Collect 5 unique dog tags
Drive By (25) - (Online) 100 kills using vehicle
Forest Ranger (15) - (Online) Knock down 1000 trees
General of the Army (35) - (Online) Reach Rank 25
Get me started (15) - (Online) Participate in one online match (Ranked)
Get the dog! (20) - (Online) Collect 50 unique dog tags
Gold Digger (30) - Find all gold bars
Half way thru (20) - Find half of all collectables
He might come in handy (15) - Complete 'Par for the Course' on normal
Here is your DD-214 (30) - Complete 'Ghost Town' on hard
Hold on! (15) - Complete 'Air Force One' on normal
Home Wrecker (15) - Destroy 200 walls
I am Bad Company! (25) - (Online) Achieve all the awards
I Love Gold! (10) - Find one gold bar
Killer on the loose (25) - Kill 25 enemies
Leatherneck (25) - (Online) Play 100 online matches
LetÃ‚Â´s take that boat (15) - Complete 'Crash and Grab' on normal
Manic Lumberjack (15) - Knock down a small forest
Master Sergeant (15) - (Online) Reach Rank 8
Never Used a Door (15) - (Online) Destroy 1000 walls
Not even a nugget! (15) - Complete 'Acta Non Verba' on normal
On Top of The World (20) - Climb to the highest spot in the game
One In a Million (20) - Hit hostile helicopter with laser designator
Ooh Rah (20) - (Online) Achieve half of all awards
Russia? (25) - Complete 'Air Force One' on hard
Say goodbye to the gold! (25) - Complete 'Crossing Over' on hard
Sir, yes sir! (30) - Complete 'Ghost Town' on normal
Specialist (10) - (Online) Reach Rank 3
Staying Alive (15) - Complete one mission without dying (any difficulty)
The Anti-Mechanic (20) - Destroy 50 vehicles. (containing enemy AI)
The Hypochondriac (20) - Use Auto Injector 50 Times
There is no I in Squad (15) - (Online) Have 20 Squad members spawn on you without dying in a single round
Vehikill (20) - (Online) Get at least one kill in every vehicle
Where are they going so fast? (25) - Complete 'Acta Non Verba' on hard
With My Devil Dogs (15) - (Online) Use Squad in the menu, find a friend and play one round
You and what army? (15) - Complete 'Crossing Over' on normal
You found it you keep it (15) - Find 5 unique collectables
Assault Rifle Efficiency Trophy - In a Round 6 Kills with Assault rifle
Avenger Trophy - In a Round 3 Avenger Points
Best Squad Trophy - Awarded In End of Round
Big Guns Trophy - In a Round 5 Kills with Artillery
Carbine Efficiency Trophy - In a Round 6 Kills with M16A2
Clear Skies Trophy - In a Round 5 Kills with Stationary Weapon
Combat Aviator Trophy - In a Round 5 Kills with air vehicle
Combat Efficiency Trophy - In a Round 6 Kill Streak
Combat Engineer Trophy - In a Round 20 vehicle Repair Points(2 Repairs)
Compact Assault Rifle Efficiency Trophy - In a Round 6 Kills with Compact Assault Rifle
Demo Pack Efficiency Trophy - In a Round 3 Kills with C4
Emplacement Trophy - In a Round 5 Kills with Stationary Weapon
Explosive Efficiency Trophy - In a Round 10 Kills with Explosives
Firearm Efficiency Trophy - In a Round 3 Kills with Handgun
Frag Out Efficiency Trophy - In a Round 3 Kills with grenade while playing Demolitionists
Grenade Launcher Efficiency - In a Round 6 Kills with grenade Launcher
Grenadier Efficiency Trophy - In a Round 3 Kills with grenade playing Assault
High Card Trophy - In a Round get the best IAR Score
Kill Assists Trophy - In a Round 5 Kill Assists
Laser Designating Efficiency Trophy - In a Round 3 Kills from Laser Designating
Ligh Machinegun Efficiency Trophy - In a Round 6 Kills with a light machinegun
Marksman Trophy - In a Round 5 Kills with Sniper Rifle
Medic Trophy - In a round 10 points from Medkit (2 Heals)
Melee Combat Trophy - In a Round 5 Melee Kills
Mine Placement Efficiency Trophy - In a Round 3 Kills with AT Mines
Mortar Strike Efficiency Trophy - In a Round 3 Kills with Mortar Strike
Naval Surface Warfare Trophy - In a Round 5 Kills with sea vehicle
Objective Attack Trophy - In a Round Destroy the Last Objective
Objective Defender Trophy - In a Round 30 Defend Points
Objective Destroyer Trophy - In a Round destroy 3 Objectives
Rocket Launcher Efficiency Trophy - In a Round 3 Kills with Rocket Launcher
Savior Trophy - In a Round 3 Savior Points
Shotgun Efficiency Trophy - In a Round 5 Kills with a Shotgun
Squad Medication Trophy - In a Round 40 Squad Member Heal Points
Squad Member Trophy - In a Round Assists or Save 5 Squad Members
SVU Efficiency Trophy - In a Round 5 Kills with the SVU
Tank Warfare Trophy - In a Round 5 Kills with Tanks
Target Tagging Efficiency Trophy - In a Round 2 Kill Assists from Dartgun Tagging
Transport Vehicle Trophy - In a Round 5 Kills with Transport Vehicle
UMP - In a Round 6 Kills with UMP
Wheels of Hazard Trophy - In a Round 2 Road Kills
Winning Team Trophy - Awarded in End of Round
1 on 1 Air - In a Round destroy an air vehicle of the same kind without assistance
1 on 1 Land - In a Round Destroy one land vehicle of the same kind without assistance
1 on 1 Sea - In a Round Destroy 1 sea vehicle of the same kind without assistance
2 Pair - In a Round get 2 of any 2 trophies
Airtime - In a Round 2 seconds air time in a land vehicle
Armor Buster - In a Round Kill 5 Armored Vehicles
Avenger Trophies - Global: 50x Avenger Trophies
Beat the House - In a Round 15 Grenade Kills
Cab Driver - In a Round 5 min as driver in a vehicle with passengers
Chopper Chopper Kills - In a Round Kill 5 Air vehicles
Dead Eye Headshots - Global: Get 100 Headshots with any sniper rifle
Destruction Site - In a Round Destroy 50 Objects
Dueces are Wild - In a Round Kill 2 Enemies of each Kit
Five of a Kind - In a Round destroy 5 vehicles of the same kind
Full Deck - In a Round 52 total Kills
Full House - In a Round Destroy 3+2 vehicles of the same King
Gunslinger - Global: 80 Kills with Handgun
Headshots - In a Round 20 Kills from Headshots
Parashooter - In a Round 4 Road Kills with any air vehicle
Santa's Litle Helper - In a Round 10 Kill Assists Points
Savior Trophies - Global: 50x Savior Trophies
Snake Eyes - In a Round get 11 Kills as two different classes
Squad Avenger Card - Global: Get 100 Avenger Points Avenging Squad Members
Squad Wild Card - In a Round 1 Squad member trophy per Squad Member
Staying Dry - In a Round 2 seconds air time with a sea vehicle
Straight Flush - In a Round Destroy 1 vehicle of each kind
Strike - In a Round Kill 10 Enemies at the Same Time
Tank Buster - In a Round Kill 5 Tanks
Three of a Kind - In a Round destroy 3 vehicles of the same kind
Entry location: Press Start and go to the unlockables screen and type in the following codes.
Recon Kit: QBU88 - Enter the code: your3mynextt4rget SpecOps Kit: UZI - Enter the code: cov3r1ngthecorn3r Support Kit: M60 - Enter the code: try4ndrunf0rcov3r USAS12 for use in multiplayer - Enter the code: aw3somef1rep0wer
Assault rifle efficiency trophy. - Get 6 kills with an assault rifle.
Avenger trophy. - Get 3 avenger points.
Big guns trophy. - Get 5 kills with artillery.
Carbine efficiency trophy. - Get 6 kills with the M16A2.
Clear skies trophy. - Get 5 kills with a stationary weapon.
Combat aviator trophy. - Get 5 kills with an air vehicle.
Demo pack efficiency trophy. - Get 3 kills with C4.
Explosives efficiency trophy. - Get 10 kills with explosives.
Firearm's efficiency trophy. - Get 3 kills with a handgun.
Frag out efficiency trophy. - Get 3 kills with a grenade while playing demolitionists.
Grenade launcher efficiency trophy. - Get 6 kills with a grenade launcher.
Laser designating efficiency trophy. - Get 3 kills from laser designating.
Light machinegun efficiency trophy. - Get 6 kills with a light machinegun.
Marksman trophy. - Get 5 kills with a sniper rifle.
Melee combat trophy. - Get 5 melee kills.
Mine placement efficiency trophy. - Get 3 kills with mines.
Mortar strike efficiency trophy. - Get 3 kills with a mortar strike.
Naval surface warfare trophy. - Get 5 kills with a sea vehicle.
Rocket launcher efficiency trophy. - Get 3 kills with a rocket launcher.
Shotgun efficiency trophy. - Get 5 kills with a shotgun.
Tank warfare efficiency trophy. - Get 5 kills with tanks.
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