Here is the full list of all 25 Defragmented achievements.
Earn 1 "S" rank
Complete "The Beginning"
Complete Act I
Complete Act II
Complete Act III
Complete Act IV
Earn 10 "S" ranks
Earn 20 "S" ranks
Visit Deal-EO World for the first time
Upgrade Deal-EO World to rank 6
Reach level 10
Reach level 20
Reach level 30
Acquire 1,000,000 Credits
Acquire 500 Deal-EO Coins
Acquire a legendary item
Kill 1,000 enemies
Fire 10,000 bullets
Open 500 containers
Reset your talents
Begin New Game Plus
Side with an old friend
Side with a young friend
Complete a mission on Hardwired difficulty