Which actor has done the most good films in Bollywood till date (not his best)?

 The actor who has an incredible filmogrpahy including many many cult classics would be Naseeruddin Shah.

Look at his filmography it is full of Cinematic gems-

1. Nishant (1975) - National award for Best film in Hindi, nominated for Palme d'Or
2. Manthan (1976)- 2 National Awards, 2 Filmfare awards, India's entry to Oscars
3. Bhumika (1977)- 2 National awards, 2 filmfare awards
4. Godhuli (1978)- 1 National award, 3 Filmfare awards South (for the Kannada version)
5. Junoon (1978)- 3 National awards, 6 Filmfares, India's entry to oscars
6. Sparsh (1979)- 2 National, 3 Filmfares
7. Aakrosh (1980)- 1 National, 6 Filmfares
8. Bhavani Bhavai(1980)- 2 National Awards
9. Albert Pinto ko Gussa Kyon Aata hai (1981)- Filmfare Best Film Critics Award
10. Chakra (1981)- 3 Filmfares, 1 National Award, 2 awards at Locarno Film Festival
11. Bazaar (1982)- 1 Filmfare, 7 nominations
12. Katha (1982)- 1 National award
13. Masoom (1983)- 5 Filmfare awards
14. Jaane bhi do Yaaro (1983)- 1 National 1 Filmfare award
15. Mandi (1983)- 1 National award
16. Ardh Satya (1983)- 2 National, 6 Filmfare awards
17. Khandhar (1983)- 3 National, 1 Filmfare
18. Paar (1984)- 3 National Awards
19. Mohan Joshi Haazir Ho (1984)- 1 National Award
20. Party (1984)- 1 National award
21. Holi (1984)- 1 National award
22. Trikaal (1985)- 2 National awards
23. Mirch Masala (1987)- 3 National Awards
24. Pestonjee (1987)- 1 National award
25. Ijazat (1987)- 2 National awards
26. Maane- 1 National award
27. Ponthan Mada- 4 National awards
28. Tridev- 2 Filmfare awards
29. Sir- 1 National award, 2 Filmfare awards
30. Kabhi Haan Kabhi Naa- 2 Filmfare awards
31. Drohkaal - 1 National award, its Tamil remake we India's entry to oscars
32. Sarfarosh- 4 Filmfares, 1 National
33. Hey Ram- 1 Filmfare. 3 National Awards
34. Monsoon Wedding- Golden Lion at Venice Film Destiva, Nominated for Golden Globe and British Academy Awards
35. Iqbal- 2 National awards
36. Maqbool- 1 Filmfare, 1 National award
37. Parzania- 2 National awards
38. Omkara- 9 Filmfares, 3 National awards
39. A Wednesday- 1 National award
40. Firaaq- 5 filmfares, 2 National Awards
41. Ishqiya- 3 Filmfare, 4 National awards
42. The Dirty picture- 3 Filmfare. 3 National Awards
43. Deol- 3 National awards
44. Dhh- 1 National award
45. Tashkent Files- 2 National awards

And there are plethora of other remarkable films he has done- Hum Paanch, Gulami, Karma, Mohra, Woh 7 din, Main wapas aaunga, Titan, Bandish Bandits, Dedh Ishqiya, Khuda ke liye. Zinda bhaag, Assi and many more