Here is the full list of all 46 Zombie Soup achievements.
Defeat 100 enemies using the Novice Class.
Defeat 500 enemies using the Novice Class.
Defeat 1,000 enemies using the Novice Class.
Defeat 100 enemies using the Rifle Class.
Defeat 500 enemies using the Rifle Class.
Defeat 1,000 enemies using the Rifle Class.
Defeat 100 enemies using the Shotgun Class.
Defeat 500 enemies using the Shotgun Class.
Defeat 1,000 enemies using the Shotgun Class.
Defeat 100 enemies using the Sniper Class.
Defeat 500 enemies using the Sniper Class.
Defeat 1,000 enemies using the Sniper Class.
Defeat 100 enemies using the Sub Machine Gun Class.
Defeat 500 enemies using the Sub Machine Gun Class.
Defeat 1,000 enemies using the Sub Machine Gun Class.
Defeat a total of 5,000 enemies.
Defeat 5 enemies with a single Impact Grenade.
Chained a bolt of lightning to 5 enemies at once using Raiden.
Fire 300 rounds of bullet with Gatling Gun without releasing the trigger.
Shoot through 10 enemies with one Railgun shot.
Hit 5 distinct enemies with Basezooka.
Spent a total of 10,000 credits.
Discovered the location of every Techno-Fridge 3000.
Unlock all Loadouts.
Unlock all Perks.
Use each weapon to defeat an enemy at least once.
Collect all hidden collectibles.
Found every civilian and successfully completed their missions.