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This and Act 3 Recruit achievement has glitched for me. I’ve played every level through the online campaign, I’ve created a run for all of them so I must be the host doing that rather than playing quickplay, which would of meant me joining someone else’s game. There’s nothing to show who is the host or what missions have been completed when being the host.

YOU MUST BE ALIVE IN THE SAFE ROOM AT THE END OF EACH MISSION IF YOU WANT YOUR ACHIEVEMENT POP WHEN YOU FINISH THE ACT. If you die but your friends finish the mission, you will be able to continue the act. But at the end of this act, the achievement won't pop.
If so, just try again this mission online with at least one friend (bots do the job) and finish the mission alive in the safe room. If this mission is the only one you missed, the achievement will pop immediately for act.
This is the way a lot of players think the achievement is glitched. But it's not.

This is for completing all maps in act 2. This can be done in online or offline mode. Before the update you could only gain achievements in online play only but since an update you can now get achievements in offline mode.

The acts and chapters are as follows. Once you complete the last one the achievements will pop.

Act 2 – A Call to Arms

The Armory
A Call to Arms
The Handy Man

Plan B
Pipe Cleaners
Hinterland
Trailer Trashed
The Clog
The Broken Bird

Job 10:22
Heralds of the Worm Part 1
Heralds of the Worm Part 2
Grave Danger