I'm not seeing any achievements for Assault... Oh well...
I've got a feeling that "become a titan" means transforming into a Titan from the original Unreal. Same with the Behemoth. Hm. I wonder if that means Skaarj will be back?
Reminds me of the Titan that would be spawned in the CTF-E mod created by Dr. Sin for UT. If one team got too far ahead in a game a Titan would spawn and play for the losing team - that was one of the most fun options ever... anything bringing back an Unreal Titan sounds like it might be fun too!