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.
Asked by Kurisu to buy cup noodles twice in a row.
Reached Steins Gate.
Saw all TIPS.
Reached Kurisu's ending.
Chapter 10 Clear
Chapter 9 Clear
Chapter 8 Clear
Reached Luka's ending.
Chapter 7 Clear
Offered tea by Faris.
Made friends with Kurisu via email.
Received an unusual proposition from Suzuha.
Learned about Luka's relationship to his sister.
Reached Suzuha's ending.
Reached Faris's ending.
Chapter 6 Clear
Chapter 5 Clear
Learned why Mayuri started making costumes.
Chapter 4 Clear
Chapter 3 Clear
Chapter 2 Clear
Chapter 1 Clear
Prologue Clear