Here is the full list of all 24 Super Turbo Demon Busters! achievements.
Level up a mercenary 20 times
Kill 250 zombies
Break 50 crates
Complete 50 raids
Kill 1000 enemies
Kill 100 ghosts
Earn 50,000 credits
Level up a mercenary once
Have 10 guns in your arsenal
Search 150 corpses
Kill an enemy while your health is at 1%
Earn 5000 credits
Complete your first quest
Kill 25 monsters
Complete your first raid
Kill your first monster
Kill three enemies with a shotgun round
Kill 250 monsters with a machine gun
Kill 2500 monsters
Kill 5000 monsters
Kill 10,000 enemies
Complete 100 quests
Unlock all mercenaries
Kill 20,000 monsters