Easiest Boss To Do This On Is:
Shadow of the Ruhnstone
This Is The Only One I Found Easy To Do
- The Kraken Bosses Tentacles Count As Henchmen
- The Bird Boss' Blight Will Kill You If You Can't Kill His Tree Henchmen To Spawn The Purifying Mushrooms.
During The Fight, Make Sure You Don't Let His Hands Charge Into Him.
- If One Does, It Damages his Resistance, But Also Kills The Hand
- If You Can't Move The Hand's Path, Stand In Front Of It To Block The Boss From Being Hit.
I Did This In Co-op.
- The Enemies All Targeting You, While You Ignore Them, Can Lead To Some Big Damage Numbers.
Achievement Pops At The End Of The Fight, Before The Score Screen.
Good Luck!