Here is the full list of all 9 A Divided Light achievements.
Complete any level without sprinting
Complete Level 1 in 1 minute or less
Complete a level with a gold time
Complete 25% of levels (5/20) with a gold time
Complete 50% of levels (10/20) with a gold time
Complete 75% of levels (15/20) with a gold time
Complete 100% of levels (20/20) with a gold time
Find the hidden room on Balldrop.
Find the Green Orb on Puzzle.