Full list of all 27 Squad Killer achievements worth 4,000 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements in the base game.
The base game contains 12 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 3,000 Gamerscore.
Buy 3 upgrades
Buy 2 upgrades
Kill 58 enemies
Die 5 times
Buy 1 upgrade
Collect 1,000 coins
Die 3 times
Collect 500 coins
Die once
Kill 18 enemies
Collect 100 coins
Kill 3 enemies
Kill 130 enemies
Kill 112 enemies
Kill 96 enemies
Kill 82 enemies
Kill 70 enemies
Collect 2,000 coins
Collect 1,800 coins
Collect 1,600 coins
Collect 1,400 coins
Collect 1,200 coins
Kill 200 enemies
Kill 186 enemies
Kill 174 enemies
Kill 162 enemies
Kill 150 enemies