Here is the full list of all 34 BanHammer achievements.
Kill Boxer 02
Reach Level 3
kill 100 axe
Kill 100 knife
Kill 100 shotgun1
Kill 100 shotgun2
Kill 100 BH smg
Kill 100 BH Heavy
Kill 100 saw
Kill 100 Chainsaw
Kill 100 Sniper 1
Kill 100 Sniper 2
Unlock Tomz Shark
Unlock Elfire
Kill Boxer 01
Kill Boss Chainsaw
Kill BH Jax Thrasher
Own tactical shotGun
Own Socolala shotGun
Own Plasma Rifle
Own BanHammer
Destroy 20 bunkers
Reach Level 10
Unlock All Stories
Complete All Quests
Craft 1 time
Craft 5 times
play with a second player
play with a companion
rescuse 50 animals
Kill 100 Hammers
Own auto shotgun
Reach Level 5
Owned all guns