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