Deleted (game was already on the list)

Control has achievements !

Thank you but this thread is not about games that have regular client based achievements like Galaxy achievements. These can (in most cases) easily be found just by searching for the feature on the product page. This thread is meant to list those games that offer you in game achievements which you can also use if you don't have any client installed since they were implemented and listed directly inside the game.

Spacechem has in-game achievements, called "challenges".

Thank you, I've added it to the list.

I also added Cult of the lamb which has ingame achievements as well :)

Worldless has in-game achievements.

Spells & Secrets has an Award Case.

Note: I only tested the demo, but why anyone that functionality.

Parkitect, Worldless and Spells & Secrets (demo) added to the list. Thank you all :)

Shogun Showdown has in-game achievements ("Quests" - can be seen when starting a new run, not in the main menu)

I can confirm that Against the Storm has in game achievements. In fact, they are linked to progression; each achievement unlocked gives Exp and build options, and many of them will unlock their GOG counterpart in galaxy.

Shardpunk has in-game achievements
and so does its demo

Kynseed can join the list

I see a lot of people say GOG forums are toxic. No doubt there is truth to that. Then I see a thread like this. It warms my heart. Sorry. I don't have a game to contribute yet.

Crystal Project has in-game achievements.