My first was Lego: Indiana Jones. I’ve only completed Lego games 100% so I suppose that is also my proudest since I barely used any walkthroughs to find all the treasures.
In terms of achievements, I'd have to say Dragon Age. It's one of the very few games I've actually felt the need to purchase DLC for, just so I could have some new segment of it to play because I loved it so much. And it's also the one I have the most completed achievements of so far (not quite 100%, but I might still attempt that in the future).
[ Edited: 19 November 2011 12:04 PM by Lt Garroway ]
My first and only two games I've finished were Cod(WAW) and Saints Row 2. Although I didn't finish the achievements just the story line. I don't think I've ever finished achievements on any game.
I did first completed game with like achievements... If we are talking first game ever then I have NO idea lol. Probably something for the ps2 because my older gaming was always sharing it with someone else. So while we may have completed it I was never on my own.