Here is the full list of all 16 SAKeRETSU achievements.
Kill 100 monsters
Found the Haven
Visit every area of Mu
Defeated Morigato
Defeated Boneru
Defeated Ghostrick
Defeated Rainbow Lizard
Finish the game
Reached level 10
Reached level 20
Reached level 30
Reached level 40
Get every item and tool
Successfully run from a battle
Capture all monsters
Pass out