Here is the full list of all 19 Secrets of Rætikon achievements.
Don't hurt anything
Avoid the unavoidable
Never get critical health
Never get hurt
Carry a total of 130 slivers
Get a female rabbit to give birth to 8 babies
Find all hidden rune orbs
Dive the deepest well
Feed the daw with prey
Hurt an animal with a stone you dropped
Hurt a buzzard by letting it dash into a solid
Get a daw to fight a buzzard
Hatch a buzzard and let it kill a lynx
Get a buzzard to hit a lynx
Lift a lynx in the air by its tail
Throw and Catch rabbit in mid air
Bring an animal from one area to another
Hit an animal with a thistle
Hatch a bird