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