Achievement Hunting

So I'm trying to get all the achievements and I'm currently at 297/307.

...I need help. Anybody amazingly good at doing Hell On Earth maps that could help me or got tips for the below?

Currently switching between Firebug and Demo as my perks.

Survival: Subduction (haven't played much so don't really know the map), Castle Volter (same again, don't know the map well), Tragic Kingdom, Biolapse,

Endless: DieSector - Complete wave 25 on Hell On Earth

Objective - Hell On Earth - Steam Fortress, Outpost, Zed Landing, Nuked, Biotics Lab,