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