

Something from a Cities Skylines DLC nobody played.
All of my 0.01ish% rarity cheevos are largely easy af things from DLCs or content updates of (somewhat) popular games that were released when most people had already moved on from these games
The really fucking hard stuff is usually around 0.5-3% (CoD BO3 zombies cheevos are insanely common for how hard they are)

From a casual standpoint: Hidden Object games. There‘s not enough good ones (and lots of games tagged as them which really aren‘t) and I find them so immensly relaxing.
Examples: Hidden Folks, Hidden through Time, varying sorts of 100 hidden Cats
Basically „Where‘s Waldo“. Really just wish there were more of them.