Here is the full list of all 26 STEINS;GATE ELITE achievements.
Played through everything in STEINS;GATE ELITE
Completed all endings.
Reached Mayuri's ending.
Learned why Mayuri started making costumes.
Asked by Kurisu to buy cup noodles twice in a row.
Reached Steins Gate.
Saw all TIPS.
Chapter 10 Clear
Reached Luka's ending.
Reached Faris's ending.
Reached Suzuha's ending.
Offered tea by Faris.
Received an unusual proposition from Suzuha.
Learned about Luka's relationship to his sister.
Reached Kurisu's ending.
Chapter 9 Clear
Chapter 8 Clear
Chapter 7 Clear
Chapter 6 Clear
Chapter 5 Clear
Chapter 4 Clear
Made friends with Kurisu via email.
Chapter 3 Clear
Chapter 2 Clear
Chapter 1 Clear
Prologue Clear