Essentially, title. I'm sure all of us have had at least one game that was such a good time, you wanted to make sure you got all the achievements, collectibles, complete every side quest just so you could get every ounce of enjoyment out of it.

For me, it's been Hollow Knight and I am very close to 100% completing Dark Souls 3. My partner is currently grinding Korok Seeds in BotW to get her first 100%. Wondering what kinds of games pulled the completionist out of you!