Posted September 17, 2018
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1. Confessed to the priest about eggs (where there's no other clue that would suggest you do so, and doing so triggers a funy easter egg)
2. Set the baron's house on fire (where doing so is necessary to progress, and there's no clue that suggests that you should do so)
or even
3. Up Left Up Right Up Up Down (where taking this path at a "lost woods"-like section lets you proceed, and this achievement is the only clue (except maybe some NPC suggesting that getting through those woods would be "a great achievement").
Likewise, given there are public lists of Achievements for all games virtually from release date, having every Easter Egg as a searchable official Achievement reduces the effectiveness of cleverly hidden but otherwise undocumented Easter Eggs that have more of an "Ah, that's cool!" impact when they go months / years without being found.
Edit : In fact someone only just found Doom 2's final secret after 24 years. I find things like that where you discover something that no-one else is looking for (because everyone assumed it was an unfixed bug) 10x cooler than official achievements where the gap in an achievement board makes it obvious you missed something.
Post edited September 17, 2018 by AB2012