Hide and Peekless

Being among the last (when seekers fail with more than 1 players remaining) does not suffice. You have to be alone.

I've remained hidden to the end like 20 times now and not once alone. Seems impossible to do this.

So this achievement is a little tricky, you have to be the last untagged but also even when you are there is a bit of delay before it triggers, also I think when you hit the 30 second mark left roughly you become permatagged so I believe you have to be the last untagged person before that happens. I've unfortunately not successfully been hidden for the entire round to confirm if that also works or not but there are some cheeky hard to reach/not easily seen hiding places that require a bit of parkour that will help you get this achievement a little easier. But I also recommend getting a lot of the upgrades/using all your tools.