Playing Halo co-op with my wife.
Killing Malenia. Finally.
Finishing the Easter egg at the end of origins in black ops 2 zombies after trying all night and seeing the special cut scene with my friends on Xbox 360 has to be up there as core gaming achievement.
Same, but the Easter egg from the moon map on Black Ops 1. Me and my friend played everyday after school for months. It was one of the first that didn’t require a full squad and it was heavily chance based because of the stupid excavators. Finally got all the dominoes to fall in the right order and we got it done, which resulted in us blowing up the Earth. Mission accomplished I guess.
I once stole 20 billion Isk from a guy in Eve Online. I was hard for days.
Meeting my wife on Elder Scrolls Online has got to be number one, but we didn’t even play the game very long to be honest lol.
I met my wife playing Rock Band. It was definitely a top gaming moment. But I didn’t realize at the time what it would lead to eventually.