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