Retrograde Arena achievements

Eliminate 25 enemies with Flak Cannon

Eliminate 75 enemies with Sniper

Shoot Machine Gun 5000 times

Eliminate 125 enemies with Machine Gun

Eliminate 25 enemies with Shotgun

Pick up Shotgun 100 times

Pick up Mirror 150 times

Shoot Hot War 400 times

Shoot Sniper 150 times

Pick up Machine Gun 100 times

Pick up Hot War 50 times

Get eliminated 50 times