Here is the full list of all 39 Death end reQuest achievements.
View each and every possible outcome.
Defeat a powerful enemy in the Pain Area.
Transform into Glitch Mode countless times.
Transform into Glitch Mode a handful of times.
Defeated countless enemies.
View Lydia's ending.
View Celica's ending.
View Lucil's ending.
View Clea's ending.
View Al's ending.
View Lily's ending.
View Shina's ending.
Clear Chapter 11.
Defeat the final boss.
Learn 50 skills using Flash Drive.
Collect 80 of the episodes.
Collect half of the episodes.
View the normal ending.
Clear Chapter 10.
Clear Chapter 9.
Clear Chapter 8.
Clear Chapter 7.
Visit the Strain Area for the first time.
Clear Chapter 6.
Clear Chapter 5.
Clear Chapter 4.
Use Install Genre for the first time.
Clear Chapter 3.
Clear Chapter 2.
Use a Summon for the first time.
Clear Chapter 1.
Use a Code Jack for the first time.
Rest in camp for the first time.
Switch over into the real world.
Perform a Flash Drive for the first time.
Connect a Knockback combo with a party member for the first time.
Clear the Prologue.
Enter Glitch Mode for the first time.
Perform a Knockback for the first time.