Terramorphous - Need help

I am a level 47 mech currently trying to farm in TVHM but I really want to kill Terramorphous in NVHM to get the achievement ''Did it all'' - it's the last mission I need to do.

I am playing Borderlands The Handsome collection on xbox one Eu server.

Please help me kill this dude. :)

Edit: I am level 50 now. :)