Here is the full list of all 76 S.U.M. - there are Slay Uncool Monsters achievements.
Slay 10 uncool monsters
Slay 50 uncool monsters
Slay 100 uncool monsters
Slay 250 uncool monsters
Slay 500 uncool monsters
Slay 750 uncool monsters
Slay 1000 uncool monsters
Slay 1500 uncool monsters
Slay 2000 uncool monsters
Unlock Archer Class
Unlock Rogue Class
Unlock Healer Class
Unlock Wizard Class
Unlock Paladin Class
Unlock Assassin Class
Level up Adventurer to 100
Level up Archer to 100
Level up Rogue to 100
Level up Healer to 100
Level up Wizard to 100
Level up Paladin 100
Level up Assassin to 100
Cleared 10 Dungeon Zones
Cleared 25 Dungeon Zones
Cleared 50 Dungeon Zones
Cleared 100 Dungeon Zones
Cleared 250 Dungeon Zones
Cleared 500 Dungeon Zones
Cleared 750 Dungeon Zones
Cleared 1000 Dungeon Zones
Cleared 10 unique Dungeon Zones with 100% correct answers
Cleared 25 unique Dungeon Zones with 100% correct answers
Cleared 50 unique Dungeon Zones with 100% correct answers
Cleared 100 unique Dungeon Zones with 100% correct answers
Cleared 200 unique Dungeon Zones with 100% correct answers
Solved 100 Addition Problems
Solved 250 Addition Problems
Solved 500 Addition Problems
Solved 750 Addition Problems
Solved 1000 Addition Problems
Solved 100 Subtraction Problems
Solved 250 Subtraction Problems
Solved 500 Subtraction Problems
Solved 750 Subtraction Problems
Solved 1000 Subtraction Problems
Solved 100 Multiplication Problems
Solved 250 Multiplication Problems
Solved 500 Multiplication Problems
Solved 750 Multiplication Problems
Solved 1000 Multiplication Problems
Solved 100 Division Problems
Solved 250 Division Problems
Solved 500 Division Problems
Solved 750 Division Problems
Solved 1000 Division Problems
Activate 10 Bonus Attacks
Activate 25 Bonus Attacks
Activate 50 Bonus Attacks
Activate 100 Bonus Attacks
Activate 250 Bonus Attacks
Clear Final Castle in Digitalia
Unlock All Gates in Digitalia
Slay 5000 uncool monsters
Slay 7500 uncool monsters
Slay 10000 uncool monsters
Activate 500 Bonus Attacks
Solved 2500 Addition Problems
Solved 2500 Subtraction Problems
Solved 2500 Multiplication Problems
Solved 2500 Division Problems
Cleared 2000 Dungeon Zones
Cleared 3000 Dungeon Zones
Solved 5000 Addition Problems
Solved 5000 Subtraction Problems
Solved 5000 Multiplication Problems
Solved 5000 Division Problems