The Bigger They Are…Defeat the Ent (Secret)
For this achievement all you need to do is kill the Ent. This boss can be killed two different ways, each way will give you a unique item & the achievement.
1, normal kill. Use any and all weapons / weapon mods to kill the Ent as fast as you can.
2, Alternative kill. Focus all your damage on one of the Ent's legs, till it breaks off. Then the Ent will crawl on the ground. Doing this will make the Ent spawn less minions but he will crawl very fast.
This video will show you both items you can get & both ways to kill the Ent. I hope you enjoy the guide & freely ask any questions you have. Till next time stay Frosty!!!