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