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 "Milky-way Crossing".
Saw all CG.
Saw all TIPS.
Read and ignored a message.
Cleared "Promised Rinascimento".
Cleared "Twin Automata".
Cleared "Recursive Mother Goose".
Saw 75% of CG.
Cleared "Antinomic Dual".
Cleared "The Orbital Eclipse".
Cleared "A Stray Sheep".
Cleared "Gehenna's Stigma".
Opened Movie Library.
Opened Sound Library.
Opened CG Library.
Opened Clear List.
Cleared "Vega and Altair".
Saw 50% of CG.
Cleared "Presage or Recognize".
Cleared "Pandora's Box".
Cleared "X-Day Protocol".
Saw 25% of CG.
Cleared "Closed Epigraph".
Cleared "Missing Link".
Answered a message from someone.
Opened TIPS List.
Began Steins;Gate 0.