Here is the full list of all 5 Mausoleum of the Medusa achievements.
Athena expects heads to roll fast, fast, fast!
You've landed a fully charged strike against Medusa!
Surpass New Hell's 10HP time of 42,147 ms completion!
Vanquish Medusa in Arcade Mode (10 HP) and see your rank on the leaderboards!
Vanquish Medusa in First Blood Mode. Now try for the leaderboard in Arcade Mode!!