Here is the full list of all 24 A.R.E.S.: Extinction Agenda achievements.
Trick a Bomber to hit and destroy a Zytron Walker (LA)
Stun 10 enemies with the EMP grenade
Destroy 20 enemies, using your Grenade Attack
In Hard Mode, defeat all the bosses using only the Zytron Blaster
Collect all the Data cubes
Collect 1000 units of each material type
Perfect the Goliath boss fight
Finish the game once
Watch all the cut-scenes without skipping
Destroy 5 or more enemies, at once with Valkyl's Zypher Cannon
Destroy 10 enemies, using your Dash Attack
Destroy 1000 enemies
Finish all of the in-game tutorials
Maximize your attack combo
Upgrade one of your weapons to its maximum level
Discover and use your first repair machine
Finish all of the stages without using a single repair kit
Finish all of the stages without dying
Achieve Synthesis Soldier rank 'A'
Achieve Synthesis Soldier rank 'S'
Achieve Synthesis Soldier rank 'SS'
Perfect the Carrion boss fight
Perfect the Sentinel boss fight
Perfect the Prime Guardian boss fight