Baseball. Mainly sets of Topps. Topps Archives, and a few others.
Completed sets (date, final card purveyor):
1993 Topps Baseball (12/14/2018, 49ants)
1992 Topps Baseball (3/23/2019, Mark 1010)
Near complete:
1994 Topps Baseball (2 more to go) [32, 777]
2018 Topps Baseball (4) [524, 582, 695, 700]
2008 Topps Baseball (6) [168, 181, 330, 375, 384, 393]
Other Topps sets getting close: 1985 (16), 2007 (36), 2015 (42), 1991, 2004, 2017
Numerous others well over half... check out my want list any time.