Completed the 3rd mission on Normal or harder.
Simply complete the 3rd mission on any difficulty higher than easy.
Score 15,000 points in Score Attack Firefight Matchmaking.
For this cheevo, you will need to rack up 15K points in 12 minutes. In the match making menu choose Score Attack and then you will be given a few options which includes Sniper Attack. If you are going at it yourself, choose Sniper Attack so that you have unlimited ammo. You can now pick up any weapon you want and have unlimited ammo. It’s pretty tough to do by your lonesome, so it is best to team up with 3 others to tackle. The points will come in slow at first, but once the stronger waves start coming in, the points will start to rack up.
Completed the 10th mission on Normal or harder.
Simply complete the 10th mission on any difficulty higher than easy.
Win a game of Invasion in the 1st phase.
In each game of Invasion there are attackers and defenders and there are three phases. For the achievement you need to stop the attacking team from taking over the capture point before time runs out. As soon as the game starts, head to the spot and find a cozy little spot to protect it from. Keep everyone from taking it and when the clock counts down, the achievement is yours.
Traded weapons with an AI ally in Campaign.
When you are at the Oni: Sword Base, you will be accompanied by a load of generic UNSC soldiers. Simply walk up to one with a weapon in hand – provided that weapon has ammo in it – and hit X to swap your weapons and take 10 GP.
Finished the 9th mission on Legendary with the Scorpion intact.
Once you start the 9th mission, you will need to clear out a few turrets and enemies and then hop in the tank. Thankfully you only need to get to the Sword Base gate with the tank intact. That doesn’t mean you need to kill everything with it. Once you reach the first area with the tank, you can clear it out and hop in the Revenant there. Use that to clear the next area and the next as well. Once the next couple of areas are clear, head back and grab the tank and mop any enemies that you may have missed. Just a heads up, you can also destroy the AA guns with the tank instead of running inside to destroy the core. Once you reach the Sword Base gate, the cheevo will pop.
At the beginning of the 4th mission, Jun and yourself will be creeping along a ledge in the dark. Soon enough you will come to an Elite that is just hanging out. Perform the assassination as you are instructed and feel free to dance on his corpse in celebration of your newly acquired 10 points.
Completed the Campaign on Normal difficulty.
If you went the route of Heroic or Legendary difficulty, then you will have gotten this achievement already. If not, then playing through of the nancy difficulty- sorry, normal difficulty- will net you this.
Reached the rank of Corporal in the UNSC.
The rank of Corporal is accomplished when you hit 10k credits. Since you start with 5K, it’s pretty easy to achieve after one play through of the single player campaign.
Completed the 9th mission on Normal or harder.
Simply complete the 9th mission on any difficulty higher than easy.
Cleared the 2nd mission without setting foot in a drivable vehicle.
After the second large wave of enemies, you will cross a stream and hop down a cliff. Just after the drop, there is a truck to the right side of the canyon. Ignore it, as well as the truck at the next base and hoof it through the rest of the mission. This part can be reached easily by loading Rally Point Alpha.
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