Here is the full list of all 20 Retro achievements.
Play Ball Protectors for the first time
Play Submariner for the first time
Play Sector Breach for the first time
Play Dogfight for the first time
Play all arcade games
Play Corrupted Ball Protectors for the first time
Play Corrupted Submariner for the first time
Play Corrupted Sector Breach for the first time
Play Corrupted Dogfight for the first time
Play all corrupted arcade games
Unlock the Corrupted Arcade by beating the story mode
Start the story mode
That was weird....
I HAVE YOU TRAPPED
Delete retro.exe
Delete virus.exe
Defeat the virus
Restore the virus
Play Zombies for the first time
Play Corrupted Zombies for the first time