Here is the full list of all 14 Hellblade: Senua's Sacrifice achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Confront Hela
Defeat Fenrir
Enter Helheim
Escape the Sea of Corpses
Pull Gramr out of the Tree
Complete the Labyrinth Shard Challenge
Complete the Swamp Shard Challenge
Complete the Tower Shard Challenge
Complete the Blindness Shard Challenge
Meet Hela for the first time on the Bridge
Defeat Valravn
Defeat Surtr
Reaching the Gate for the first time
Collect all of the Lorestones