Here is the full list of all 15 Koler achievements.
Passed the tutorial level.
Defeated Inferno Dragon
Defeated Greeps
Defeated Chilly Psychic Skull
Get your very first Color Shards
Make 10k damage in total
Make 100k damage in total
Make 1m damage in total
Died for 1 time
Died for 10 times
Died for 100 times
Defeated 3 bosses during 1 loop
Activated your first Color Altar
Activated 10 Color Altars
Activated 60 Color Altars