Here is the full list of all 30 Paint the Town Red achievements.
Complete the Saloon in Challenge mode in under 3:30 minutes
Complete the Biker Bar in Challenge mode in under 3:30
Complete the Prison in Challenge mode in under 2:30 minutes
Complete Arena Challenge 1 in under 9:30 minutes
Complete 3 Arena challenges
Complete an Arena challenge
Defeat The End
Reach Fire & Blood I
Defeat the Trickster
Reach The Construct
Destroy the Jerk
Defeat the Aberration
Reach Islands I
Complete the Western Saloon in Challenge mode
Defeat the Necromancer
Capture the Pursuer
Upgrade one of the Beneath classes
Reach Ruin I
Defeat a Shard Lord
Reach Crystal Caverns I
Unlock a permanent upgrade in Beneath
Rescue the Apostate
Complete the Pirate Cove in Challenge mode
Complete the Prison in Challenge mode
Complete the Disco in Challenge mode
Complete the Biker Bar in Challenge mode
Die for the first time in Beneath
Enter Beneath for the first time
Complete a Scenario level without modifiers
Complete 5 Arena challenges