Here is the full list of all 12 HAWKEN achievements worth 1,000 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox One.
Eliminated an enemy mech while its weapons were overheated.
Eliminate an enemy while it is under the effect of your EMP.
Eliminate an enemy mech that is zoomed in while you are also zoomed in.
Eliminated an enemy mech that was currently zoomed in.
Eliminate 10 enemies without dying.
Deal over 10,000 damage to yourself with your own explosive weapons.
Eliminate an enemy mech by landing on top of it, crushing its robot soul.
Survive for 15 seconds with less than 10% armor, and then eliminate an enemy mech.
Eliminate an enemy mech while it is repairing.
Eliminate 10 enemy mechs while they are repairing.
Eliminate 100 enemy mechs while they are repairing.
Complete the final stage of VR Training and receive your Basic Training Certification.