Here is the full list of all 35 STEINS;GATE: Linear Bounded Phenogram achievements.
Cleared the game with an unread message in Phone Trigger.
Cleared "Vermillion Soteria."
Unlocked 25% of CGs.
Unlocked a 2nd stage scenario.
Cleared "The Caged Bird Sings."
Unlocked a 1st stage scenario.
Opened the MOVIE LIBRARY.
Opened the SOUND LIBRARY.
Opened the CG LIBRARY.
Cleared "Dr. Jekyll Online."
Changed the ringtone for Phone Trigger.
Changed the wallpaper on the Phone Trigger standby screen.
Viewed Phone Trigger transmission history at least once.
Replied to a message from someone in Phone Trigger.
Viewed a message in the Phone Trigger reception history at least once.
Opened the TIPS LIST.
Opened the CLEAR LIST.
Started STEINS;GATE - Linear Bounded Phenogram.
Completed everything in STEINS;GATE - Linear Bounded Phenogram.
Cleared "Ghostly Rendezvous."
Cleared "Built with Love."
Cleared "Superhero Chat-Noir."
Cleared "Hermaphroditus in the Labyrinth."
Cleared "Eternal Polaris."
Cleared "The Quantum Awakening."
Cleared "Abduction Across Three Worlds."
Cleared "Lunar Bifröst."
Unlocked 50% of CGs.
Unlocked 75% of CGs.
Unlocked all CGs.
Viewed all TIPS.
Viewed all messages.
Unlocked a 3rd stage scenario.
Unlocked a final scenario.
Unlocked a hidden scenario.