When the going gets tough ....

[Coffee Monster]

achievement for hard wins in co-op.... anybody know how to unlock this? stuck at 40% and won't track

[Hiroko]

Play co-op, on Hard mode. I'm not sure if it has to be standard Hard, or if any of the hard variants count. Daily Challenges do not count and, if you quick-match to some one else who is hosting the daily challenge, you will not get credit for that match.

[ShingerZero]

1) Host on your own;
2) Don't lose or you have to start from scratch;
3) Don't change the range of monkey placement for players;
4) (Unsure here, but just in case) Play on maps where you didn't get a medal yet.
By following these steps, you should get counter up.
Also, playing on hard standard should be enough.

[Coffee Monster]

so i tried all what you guys said and still not counting, ShingerZero, when you say 'host on your own' you mean I just need to be the host right?

Anyway i tried hosting, hard, standard, didn't change from default placement, tried with 2, 3 and 4 players on various maps i didn't already have medal for and none counted, still on 40%......

[Hiroko]

When you load up btd6, do you see leaves next to your name? This would indicate that you've been marked as a cheater, and as such no progress would be saved. This would mean no new medals, gold, instas, etc are saved when you exit the game. You could do a quick test by running through an easy game to change your monkey money then restart btd6 to see if it saves. Or just do the fix anyway, which might solve the problem if its a verify game files situation as well:
Remove mods, uninstall btd6, restart pc, reinstall btd6, don't have cheat software/websites open while playing btd6.

[Coffee Monster]

That not the issue, I've never cheated for any game, all the other achievements progress fine and I'm unlocking money as normal etc. literally just that achievement that's stuck....

Will try a reinstall and verify files etc anyway for what it's worth.

[ShingerZero]

1) Did you try to rehost if you lost?
2) When you beat a map - don't continue and quit (after roud 80) immediately.
I can only guess that these 2 steps might be missing. I personally had issues with that achievement too a while ago and figured out a good amount options that doesn't trigger the counter for some reason. But there's still a chance that it might not get triggered, just keep trying at this point.
I've searched about the problem a while ago and there wasn't many info about it.

[Coffee Monster]

so i tried a couple more after reinstalling and managed to get it up to 80%, although i'm not entirely sure what i did different cause now it doesn't seem to be tracking again -_-