There are 709 licensed titles in the NES library in the US and PAL regions and on top of that you have the 113 unlicensed games. Counting the Japan-exclusive titles you've got, fuck I dunno, over a thousand games anyways. And this is the NES, titles are easy and short. So how many games have you beaten? 50? 100?
My friend brought this subject up with me and I was sort of surprised by the fact that it was less than thirty for me, 29 to be precise. So, what's your number?
You can count which way you like but I chose to only include games that I've played without saving/loading at all, which means that a lot of games I've emulated dun' go on the list. Also, there's a bunch of games that I played on the NES when I was little that I think I might have beaten, but since I don't know for sure I didn't feel like adding them.
Edit: I had forgotten about two games, so my number was actually 31!!!
1. Bubble Bobble
2. Castlevania
3. Castlevania III
4. Chip 'n Dale: Rescue Rangers
5. Contra
6. Double Dragon III
7. Family Feud
8. Ghostbusters II
9. Kung Fu
10. The Legend of Zelda
11. Maniac Mansion
12. Mega Man
13. Mega Man II
14. Mega Man III
15. Mega Man IV
16. Mega Man V
17. Mega Man VI
18. Ninja Gaiden
19. Ninja Gaiden II
20. Ninja Gaiden III
21. Nintendo World Cup
22. Rush'n Attack
23. Shadowgate
24. Super C
25. Super Mario Bros.
26. Super Mario Bros. II
27. Super Mario Bros. III
28. Tecmo World Wrestling
29. Vice: Project Doom
30. Adventures in the magic kingdom
31. Teenage Mutant Ninja Turtles II
32. Battletoads and Double Dragon
Also, I chose to only include games with a, more or less, real ending. So most sport/contest games were excluded as well as stuff like rescue: embassy mission and whatnot.