Here is the full list of all 28 STEINS;GATE 0 achievements. It takes around 35-40 hours to unlock all of the achievements on Windows.
100% Completed Steins;Gate 0.
Cleared "Vega and Altair".
Cleared "Milky-way Crossing".
Cleared "Presage or Recognize".
Cleared "Promised Rinascimento".
Cleared "Recursive Mother Goose".
Cleared "Antinomic Dual".
Saw all TIPS.
Cleared "Twin Automata".
Cleared "The Orbital Eclipse".
Cleared "A Stray Sheep".
Opened Movie Library.
Opened Sound Library.
Cleared "Gehenna's Stigma".
Read and ignored a message.
Cleared "Pandora's Box".
Answered a message from someone.
Cleared "X-Day Protocol".
Cleared "Closed Epigraph".
Cleared "Missing Link".
Began Steins;Gate 0.
Opened CG Library.
Opened Clear List.
Opened TIPS List.
Saw 25% of CG.
Saw 50% of CG.
Saw 75% of CG.
Saw all CG.