Eat This! Achievement in Doom 3: BFG Edition
Defeat the Maledict boss in RoE
How to unlock Eat This!
Story related and cannot be missed.
This is the final boss of the RoE expansion. The best way to tackle this boss is to use the Bloodstone and then unload rockets into him while he is flying. I would suggest using the Grabber on the Forgotten Ones that fly out to you. Dodge his attacks and when he lands, unload BFG rounds into him and he should go down fairly easily.