Here is the full list of all 25 Slime Masters achievements.
Dip a slime in a colored pool
Survive without moving
Survive without leveling up
Kill 1000 monsters of any type
Kill 10 000 monsters of any type
Kill 1 000 000 monsters of any type
Kill 1 boss
Kill 100 boss
Kill 10 000 boss
Dip your slime in a colored pool 100 times
Dip your slime in a colored pool 1000 times
Dip your slime in a colored pool 100 000 times
Have a total of permanent power-up of 5
Have a total of permanent power-up of 25
Have a total of permanent power-up of 50
An hour of playtime
A day of playtime
A week of playtime
A month of playtime
A year of playtime
Pick-Up the collectables and carry it to it's master
Pick-Up the experience orbs and carry it to it's master
Heal the player every X seconds
Slime that attack the closest monster
Slime that attack the monster with the highest HP