Gaming related goals that you gave up

I couldn't get enough sleep.

I could't finish my backlog, before buying more games to play

I can't get to the end of Crusader Kings 2

Gave up on getting 100% completion on Super Mario Sunshine. It's too tedious.

I don't remember because my memory is bad.
However, it becomes sleep deprivation! The fact that is hurting the body.XD
Oh, is my memory poor because of lack of sleep?

In any case, you should avoid playing multiple games at the same time.
Indigestion gameplay is probably not fun.

I wanted to get every achievement in Skyrim.
I would still like to do so, but I just don't have enough time right now between general life, university, and my jobs.

Gave up on beating Radiant Absolute Radiance on Hollow Knight months ago, but not for good. It's the only fight left for me to complete the Hall of Gods.

I stopped playing Wings of Vi (hard mode) after dying like 300 times at the Twin Orcs. Like all other bosses it's a try & die thing, but the dying thing started to become a little too stressful..

I achievement hunt, some games seem easy to 100%, but they turn out to be very tricky. I can't think of any specific names, but there are quite a few games I have sitting there with one or two achievements that are just way way too finnicky to get.

But if you still play payday, or would be interested in playing payday 2, I'd be up to do overdrill, besides, I have several friends who need to do overdrill to become worthy for the secret.

I recently gave up achievement hunting since it was taking away the fun from gaming. Instead of just enjoying the game I just worried about it I would get certain achievements or not. It kind of became an obsession and it wasn't particularly healthy. Now I don't hunt any achievements regardless how easy they are. I won't even look at the achievement page anymore.

A more or less recent goal I gave up: in Borderlands, I didn't defeat Crawmerax. I would have needed to level up some more, and didn't feel like it.

I recently gave up on Celeste. The latest chapter did some very unfun things and I felt so unburdened when I decided to put it down and not come back.

I gave up on finishing Sierra adventure games without a guide because of King's Quest III.

Not have a backlog of games.

I couldn't win a Minesweeper game at the hardest difficulty. I always end up choosing/guessing the wrong tile near the very end when there's basically a 50% chance of the tile being a bomb. I've already uncovered all the tiles that I'm confident of at that point.

well ... gave up on sleeping dogs because the definitve edition is indicated in germany ... you cant get all achievments

Now that you mentioned Payday The Heist and Overdrill, I gave up on getting in the Payday: The Secret group. (You need to do the Overdrill (in Payday The Heist) on hardest difficulty and someone in the group has to record it.)

Oof, too long to make a list. Basically everytime I "beat" a game just to find out that there's more game beyond but brutally difficult, or just reaching a boss that I simply can't be asked to deal with.
That said there is one game I gave up on just because it was way too sad to continue, Valiant Hearts, for some reason knowing that most of the stuff is based on real events with just a bit of gamey fiction on top hit me much harder than any fully fictional game. It's much easier for me to handle sad stuff happening on screen when I know it originated from someone's imagination.

In Spider-Man 2 getting all the Skyscraper Tokens - only had to collect one more but absolutely couldn't find it.

Also never managed to beat System Shock.

I gave up trying to finish any Souls game. Tried 3 of them (DS1, BB, DS3).

Darkest Dungeon and Xcom 2.

I love both and have like 100 hours in each or at least a significant amount, I've never finished either as the same pattern happens.

Start the game, love it, play for hours, get quite far in, start to get annoyed at a death, inoptimal upgrade, waste of resources, decide to restart...rinse, wash, repeat.

I got really far in Xcom2 one time and then misunderstood a mission objective timer, my entire squad got captured as a result when I could have easily survived.

The other thing I do in these games is have a "break" and by the time I return I've fogotten all mechanics and story so I have to restart.

I gave up on the goal of playing games with any regularity.