Wilt is in tier 3?
Chamberlain holds 72 NBA records, 68 by himself. Among his records are several that are considered unbreakable, such as averaging 22.9 rebounds for a career or 50.4 points per game in a season, scoring 100 points or 55 rebounds in a single game, scoring 65 or more points 15 times, 50 or more points 118 times.
Wiki.