Here is the full list of all 14 Virush achievements.
Completed Tutorial
Completed Arcade Score Challenge 1
Completed Arcade Score Challenge 2
Completed Arcade Score Challenge 3
Completed Hunted Score Challenge
Completed Boss Rush Score Challenge
Completed Breathe Score Challenge
Completed Countdown Score Challenge
Completed Curse Score Challenge
Completed Ghosts Score Challenge
Completed Tail Bender Score Challenge
Completed Tri-Rush Score Challenge
Completed Molting Score Challenge
Completed Tornado Score Challenge