Here is the full list of all 12 Fe achievements.
Lead a bear to a Silent camp
Find all Silent Helmets
Unlock all abilities
Glide from the top of the waterfall all the way to the marsh
Jump from one owl's back to another
Free an old friend
Complete the game
Gather 10 or more lizards for a conversation
Find all the Fe playing hide & seek
Jump between 10 different trees without touching the ground
Find your first Silent Helmet
Learn to climb trees