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