Here is the full list of all 28 Mech Rage achievements.
Win Command Deck level.
Destroy Alien Gateway.
Win game on hard difficulty.
Upgrade armor to level 5.
Collect all upgrades.
Upgrade ammo capacity to level 5.
Kill 500 Kamikaze aliens.
Give Mysterious Contraption a go.
Upgrade shield to level 4.
Kill 10 Hive Mother aliens.
Win Engineering Deck II level.
Kill 1000 enemies.
Get rid of the evidence.
Win Main Deck level and destroy Scorpion Boss.
Upgrade speed to level 4.
Kill 300 Rascal aliens.
Destroy 500 crates.
Win Engineering Deck I level.
Find upgrade hidden in weird place…
Upgrade dash to level 4.
Kill 240 Grunt aliens.
Win Hub level and destroy Sentinel boss.
Destroy 300 barrels.
Win Hangars level.
Win Storage Deck II level.
Win Storage Deck I level.
Die in tutorial.
You've been naughty and used cheats.