Steins;Gate - Achievements

The achievements listed here are from Steam.

Steam Achievements	How to get
The Choice of Steins Gate Started Steins;Gate.	Run the game for the first time
Prologue of the Beginning and the End Prologue Clear.	Finish Prologue chapter
Time Travel Paranoia Chapter 1 Clear.	Finish Chapter 1
Interpreter Rendezvous Chapter 2 Clear.	Finish Chapter 2
Butterfly Effect's Divergence Chapter 3 Clear.	Finish Chapter 3
Chaos Theory Homeostasis Chapter 4 Clear.	Finish Chapter 4
Dogma in Event Horizon Chapter 5 Clear.	Finish Chapter 5
Metaphysics Necrosis Chapter 6 Clear.	Finish Chapter 6
Made in Complex Chapter 7 Clear.	Finish Chapter 7
Fractal Androgynous Chapter 8 Clear.	Finish Chapter 8
Endless Apoptosis Chapter 9 Clear.	Finish Chapter 9
Genius Girl's Melancholy Made friends with Kurisu via email.	Trigger 'True End Flag 1' Head to True End Flag page to know how to trigger it.
Irreversible Reboot Reached Suzuha's ending.	Get Suzuha Ending At chapter 6, don't send D-mail to get this ending.
Isolated Jamais Vu Reached Faris's ending.	Get Faris Ending At chapter 7, don't send D-mail to get this ending.
Link of Corruption and Rebirth Reached Luka's ending.	Get Luka Ending At chapter 8, don't send D-mail to get this ending.
Stardust Sky Reached Mayuri's ending.	Get Mayuri Ending You'll get this ending if you didn't trigger 'True End Flag' or only trigger up to 4 'True End Flag' in total.
Paradox Meltdown Reached Kurisu's ending.	Get Kurisu Ending You'll get this ending if you trigger up to 5 'True End Flag' in total. Head to True End Flag page to know how to trigger it.
Open The Steins Gate Reached Steins Gate.	Get Rintaro Ending You'll get this ending if you trigger all 6 'True End Flag' in total. Head to True End Flag page to know how to trigger it.
All Worldlines Complete Completed all endings.	Get all six endings
25% CG Achievement Unlocked 25% of CGs.	Get 25% of CGs at "Extras" tab
50% CG Achievement Unlocked 50% of CGs.	Get 50% of CGs at "Extras" tab
75% CG Achievement Unlocked 75% of CGs.	Get 75% of CGs at "Extras" tab
100% CG Achievement Unlocked 100% of CGs.	You must get all 76 CGs before you get the last one. To get the last CG, start new game and skip the prologue, then open your inbox for the oldest mail and it should have the last CG as email attachments.
Memories of the Self [Phone Trigger] Viewed email send history at least once.	View email at outbox manually for the first time
Memories of Another [Phone Trigger] Read an email.	View email at inbox manually for the first time
Resonant Reaction [Phone Trigger] Replied to an email.	Reply to an email for the first time
Message of Oblivion [Phone Trigger] Cleared someone's mail without reading it.	Reach any ending without using 'Phone Trigger' button
Vision Projection [Phone Trigger] Changed phone wallpaper.	Change phone wallpaper for the first time
First Sound [Phone Trigger] Changed ringtone.	Change phone ringtone for the first time
Identity of Complete Isolation [Phone Trigger] Ignored a phone call.	Ignore a phone call
Homerun-level Clumsiness Made 10 mistakes while attempting to set the PhoneWave (name subject to change)'s timer.	You need to deliberately made 10 mistakes while attempting to set the PhoneWave's timer. You had two chance to get this achievement at chapter 1.
Hero of RaiNet [Phone Trigger] Received all 13 RaiNet episode summaries.	Get all 5 RaiNet episode summaries Episode 1 Get: Chapter 1, mail from Mayuri Mail subject: Upa... Reply: upa Mail subject: Don't sell it >< Reply: Kakeru-kun Mail subject: it's interesting Episode 11 Get: Chapter 3, mail from Faris Mail subject: PHANTASM is the cat's meow♪ Reply: theme song Mail subject: RaiNet OP 2 Reply: RaiNet Kakeru Mail subject: RaiNet Ep 13 Episode 2 Get: Chapter 4, mail from Luka Mail subject: About RaiNet Episode 5 Get: Chapter 4, mail from Mayuri Mail subject: Speaking of lotteries Reply: magazine Mail subject: Going out? Lelele Reply: Crunchy-kun Mail subject: About Luka-chan Reply: Kakeru-kun Mail subject: Kakeru-kun Episode 8 Get: Chapter 4, mail from Faris Mail subject: Sign of increasing misfortune Reply: He Mail subject: About abilities Reply: Chinchilla Star Mail subject: Re:Re:Ep 8 Reply: Ep 8 Mail subject: About Ep 8
Froggy Fad Demise [Phone Trigger] Received all Gero Froggy wallpapers.	Get all 5 Gero Froggy wallpapers Gero Froggy, Cat Gero Froggy, & Cow Gero Froggy Get: chapter 3, mail from Luka Mail subject: About frogs Reply: Gero Froggies Mail subject: More news about the frogs Fatty Gero Froggy Get: chapter 7, mail from Kurisu Mail subject: The key (ﾉД`) Reply: I don't have a key Mail subject: ( ˚ д˚ ) Reply: frog Mail subject: gero froggy Burning Gero Froggy Get: chapter 7, mail from Kurisu Mail subject: The key (ﾉД`) Reply: home Mail subject: Home Reply: Hyah ha Mail subject: GOGOGOGOGOGO Reply: I'm gonna give it to you straight Mail subject: Blazing heat!
Songs of Chaos [Phone Trigger] Received 4 songs from a chaotic head.	Get all 4 songs from chaotic head The necklace of cabala Get: chapter 2, mail from Faris Mail subject: Original Sin level rising to 180% Reply: 2000 Mail subject: Song of Propehecy find the blue & fake me Get: chapter 3, mail from Faris Mail subject: PHANTASM is the cat's meow♪ Reply: PHANTASM Mail subject: The vocalist is a beautiful girl Reply: Chaos Mail subject: Re:Re:The vocalist is a beautiful girl Give a deal the blood against the guilty Get: chapter 5, mail from Faris Mail subject: ComiMa Reply: collapsing Mail subject: Re:Re:ComiMa
RaiNet's Mascot [Phone Trigger] Received 2 Upa wallpapers.	Get all 2 Upa wallpapers Upa & Metal Upa Get: chapter 1, mail from Mayuri Mail subject: Upa… Reply: upa Mail subject: Don't sell it ><
Princesses of Chaos [Phone Trigger] Received 3 wallpapers of characters from a chaotic head.	Get all 3 wallpapers of characters from a chaotic head FES Get: chapter 1, mail from Faris Mail subject: The final battle is close at hand nya Reply: red southern cross Mail subject: So that was it after all nya Seira wallpaper & Seira After Awaking wallpaper Get: chapter 5, mail from Mayuri Mail subject: What made me happy today Reply: Fubuki-chan and Kaede-chan Mail subject: Huh?
Cruel Sister Learned about Luka's relationship to his sister.	Get: chapter 2, mail from Luka Mail subject: I made sweets Reply: family Mail subject: My family Reply: My sister Mail subject: About my older sister
Discontinuous Qualia [Phone Trigger] Asked by Kurisu to buy cup noodles twice in a row.	Get: chapter 4, mail from Kurisu Mail subject: Did you write it? Reply: report Mail subject: Please? Reply: cup noodles Mail subject: Favor to ask
Warrior Girl's Pride [Phone Trigger] Received an unusual proposition from Suzuha.	Get: chapter 4, mail from Suzuha Mail subject: Akihabara's Reply: peaceful Mail subject: Now, on TV
Cat's Tea Time [Phone Trigger] Offered tea by Faris.	Get: chapter 4, mail from Faris Mail subject: Sign of increasing misfortune Reply: He Mail subject: About abilities Reply: NyanNyaian Mail subject: Cat tounge nya
Passions Best Forgotten [Phone Trigger] Learned why Mayuri started making costumes.	Get: chapter 5, mail from Mayuri Mail subject: What made me happy today Reply: cosplay Mail subject: The reason
Skyclad Observer Unlocked all achievements	Get all achievements

Guide List

Steins;Gate
Generals	Game Information
Guide	Guide | Mails List | True End Flag | Achievements

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Source: See Source page.