Full list of all 14 Mimic Arena achievements worth 1,000 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Xbox One.
Jump and Shoot 5000 times.
Destroy 200 mimics in Infiltration mode.
Destroy 100 mimics in Deathmatch mode.
Destroy 50 enemies with projectiles that have bounced 3 or more times.
Have your mimics destroy 100 enemies.
Destroy 25 enemies with reflected projectiles.
Destroy 5 or more enemies with a single shot.
Destroy 100 enemies with projectiles that not bounced off any walls.
Destroy 3 enemies with a single shot 10 times.
Destroy 4 enemies with a single shot 3 times.
Destroy 2 enemies with a single shot 25 times.
Destroy a player and their mimic with the same shot 25 times.
Don't touch the ground for 60 seconds in a single life.
Score multiple points back to back in the Infiltration game mode 10 times.