I think one of the biggest achievements I have memory of is in shovel knight. A complex game on it's own but even more when you add the expansion bonuses like Specter of Torment.

Specter of torment has a special challenge you can complete right from the start of the game, it's called the tower challenge or something like that and it consists of guess what, a challenge in the form of a tower!

The challenge is full of hazards, enemies and traps (Not the anime ones) and it's your obligation as part of the challenge to pass through the complete tower in a certain amount of time before you get shocked by the floor as you go up. (There's literally a lightning ray following you through each segment of the tower as you go. You missed a jump? That might be the end of your run.)

My achievement consists of clearing the tower challenge without using items (which would help a lot, tbh) and without getting hit. I don't have a recording of myself actually going through the level but this motivates me to maybe get shovelknight on my pc and record it!

I'll leave a short clip of a youtuber called Lloydarts completing the challenge.

This is like my favorite part of the game because it tests the actual skills of the player in terms of learning how Specter Knight moves and works. Simply, there's no easy way to win it and that's why I enjoy it so much.