I have been trying numerus times on getting this 2 achievements (Avt 5 The war that time forgot & The demonic prisoner) in cooperative mode(with a friend), however it can never be completed. abut the rest of the achievements can be done.
There’s a stickied thread at the top of the forum - How to Write a Good Bug Report
- Please use the Search feature to search the forum and see what bugs are posted. If you have a duplicate thread, we will lock it and point you to the current thread where the bug is being discussed.
Here are 15 threads that mention “The war that time forgot”…
https://us.forums.blizzard.com/en/d3/search?q=war%20that%20time%20forgot%20category%3A23%20order%3Alatest
In those threads, you’d find explanations such as this…
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Complete the event in Campaign mode. This is bugged indeed, and devs don’t give a s h i t about it.