Here is the full list of all 14 Crimson Nights achievements.
Defeat the Boss in floors or crawler.
Play in every dungeon type at least once in floors or crawler.
Have at least 10,000 gold in the bank.
Push a friend’s body around for a little while.
Beat the 100th floor in floors mode.
After you have your sword blocked by a Large Skeleton, block their returning attack. (x3)
Get to the secret game.
Get to all 4 dungeons in one play through in floors or crawler
Choose the default helmet, armor, and color.
Level a weapon all the way to level 10
Beat 10 floors without taking any damage.
Beat 10 floors without killing anything.
Play the game between 9pm-12am.
Swap weapon 20 times in one playthrough.