Yeah, there's a lot of those types on the site. Like Super Mario Bros has Pacifist achievements to complete a World without hurting any enemies or becoming Fire Mario. I'm sure some people appreciate them, but it's not something I'm going to try.

https://retroachievements.org/achievement/40405

Why? It sounds fun! At the end of the day a game is just a challenge to overcome right?

I don't have time in my life to tackle every single challenge presented to me, and there are over 355,000 achievements on Retro Achievements, not to mention thousands of speedrun leaderboards and other things. I have to pick and choose (or just play the game and get whatever I get). That particular achievement sounds like it would likely take a lot of time and be quite frustrating to pull off.

That being said, I'm not asking for it to be removed or anything. It's just not something I'm ever going to try to complete myself (maybe I'll manage it on accident). Clearly 4.5% of the people who have played the game with Retro Achievements have managed to pull it off.

"Beat X without using System Y" is a pretty common achievement though. Half-Life 2: Episode 1 has an achievement that begged me to play the game again: beat the episode while only firing one shot.

Being able to beat a game while not using a core system can be a sign of good game design, or an exceptionally skilled player. Look at Super Mario 64 and speedrunner's ability to finish levels with a single press (but not release!) of the jump button.

I don't have a problem with them being there personally (op did), just acknowledging that there's quite a few games with those types of achievements. I don't want to bother with them myself, but I know others do, and that's fine.

Another bad style of achievements: RNG-heavy.

For instance, to get the “catch shiny Pokémon” achievements in Pokémon Crystal (https://retroachievements.org/game/11841), you have 1/8192 odds on encounter… for each Pokémon, and there are 213 of them.

why is that a bad achievement?