Here is the full list of all 17 Beater Spirit achievements.
Kill 50 skeletons.
Get last silver hairstyle.
Play 60 matches.
Play 30 matches.
Dead 20 times.
Kill 50 slugs.
Kill 50 bats.
Play 10 matches.
Get last bronze hairstyle.
Get last bronze costume.
Get last bronze weapon.
Get last silver costume.
Get last silver weapon.
Get last gold hairstyle.
Get last gold costume.
Get last gold weapon.
Reach 20 level and open gold tokens.