Here is the full list of all 13 Imprisoned Hyperion achievements.
Start a new game
Poison the troglodyte leader in an abandoned fort
Disable the protection of Geron's house
Eating someone's heart
The Basilisk was killed by a reflection
Get a skill point
Find plate armor
Rub the lamp
Take Mirum's fate into your own hands
get lock picking level 3
Get speech level 3
Get reading level 3
Finish the game without killing the ancient