Here is the full list of all 34 Fragments Of A Mind achievements.
Completed all main chapters in time limit on any difficulty
Completed all main chapters without dying on any difficulty
Completed the epilogue
Completed the game on any difficulty
Read the journal (Epilogue)
Completed the ninth chapter
Found all memory fragments in all main chapters
Found all orbs of power (Mirror)
Completed the eighth chapter
Did not use Truesight when fighting the Witch for the first time (Graveyard)
Only used the cannon on the right side during a big fight (Fortress)
Completed the seventh chapter
Completed the sixth chapter
Found the secret room near the nine rooms puzzle (Cellars)
Completed the fifth chapter
Didn't turn off electricity in the second part of downtown (City)
Completed a main chapter without dying on easy difficulty
Completed a main chapter without dying on normal difficulty
Completed a main chapter without dying on hard difficulty
Completed a main chapter in time limit on easy difficulty
Completed a main chapter in time limit on normal difficulty
Completed a main chapter in time limit on hard difficulty
Completed the fourth chapter
Eaten all three pieces of food in less than a minute (Farm)
Completed the third chapter
Defeated the forest spirit without using any skills (Forest)
Completed the second chapter
Completed the red path first (Marsh)
Checked the campsite (Prologue)
Completed the prologue
Completed the first chapter
Lighted all four torches in the maze without dying (Bridge)
Collected all memory fragments in any chapter
Collected a perk point in any chapter