Here is the full list of all 21 Tales of Novariel achievements.
Find 5 forests in one go
Start the game
Create your first char
Kill your first slime
Kill 10 slimes
Kill 50 slimes
Kill 100 slimes
Kill 500 slimes
Kill 1000 slimes
Kill your first boss slime
Discover your first City
Die for the first time
Finish the game on easy
Finish the game on normal
Finish the game on hard
Discover god mode
Find your first item
Find a common item
Find a rare item
Find an epic item
Find a legendary item