First players to reach X total XP:

100,000,000	Skulled	February 21, 2021	See rest
200,000,000	Skulled	February 21, 2021	See rest
300,000,000	Skulled	April 24, 2022	See rest
400,000,000	Skulled	May 22, 2024	See rest
500,000,000	TBD		See rest