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