Here is the full list of all 14 Retrovirus achievements.
Terminate the Reaper
Terminate the Wraith
Terminate the Worm
Terminate the Hydra
Beat all levels on Admin difficulty
Beat all levels on Hacker difficulty
Find all emails
100% the campagin
Beat all levels in co-op
Win a Deathmatch game against 2 or more players 4 times
Lead a team of 2 or more to victory in Team Deathmatch 3 times
Win a Domination game 6 times
Win a MOBA game 6 times
Regenerate completely from 5 health