Here is the full list of all 20 CROSSCHANNEL: Steam Edition achievements.
Unlock all gallery thumbnails.
Finish scenario 9 in Another Story.
Finish scenario 8 in Another Story.
Finish scenario 7 in Another Story.
Finish scenario 6 in Another Story.
Finish scenario 5 in Another Story.
Finish scenario 4 in Another Story.
Finish scenario 3 in Another Story.
Finish scenario 2 in Another Story.
Finish scenario 1 in Another Story.
Reach the bad ending.
Finish all routes.
Send back Youko.
Send back Miki.
Send back Sakuraba.
Send back Misato.
Send back Touko.
Send back Kiri.
Enter the loop.
Start the game.