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