First players to reach 99 in each skill:


Attack   Madgamer2   October 11, 2007   See rest
Defence   Madgamer2   October 11, 2007   See rest
Strength   Madgamer2   October 11, 2007   See rest
Constitution   Madgamer2   October 11, 2007   See rest
Ranged   Madgamer2   October 11, 2007   See rest
Prayer   Madgamer2   October 11, 2007   See rest
Magic   Madgamer2   October 11, 2007   See rest
Cooking   Madgamer2   October 11, 2007   See rest
Woodcutting   Madgamer2   October 11, 2007   See rest
Fletching   Madgamer2   October 11, 2007   See rest
Fishing   Madgamer2   October 11, 2007   See rest
Firemaking   Madgamer2   October 11, 2007   See rest
Crafting   Madgamer2   October 11, 2007   See rest
Smithing   Madgamer2   October 11, 2007   See rest
Mining   Madgamer2   October 11, 2007   See rest
Herblore   Madgamer2   October 11, 2007   See rest
Agility   Madgamer2   October 11, 2007   See rest
Thieving   Madgamer2   October 11, 2007   See rest
Slayer   Madgamer2   October 11, 2007   See rest
Farming   Madgamer2   October 11, 2007   See rest
Runecrafting   Madgamer2   October 11, 2007   See rest
Hunter   Madgamer2   October 11, 2007   See rest
Construction   Madgamer2   October 11, 2007   See rest
Summoning   Kingduffy   February 13, 2008   See rest
Dungeoneering   Wisely Done   May 14, 2010   See rest
Divination   Pieter   August 30, 2013   See rest
Invention   Le Me   January 26, 2016   See rest
Archaeology   TBD   See rest


* Keep in mind that data before 2007 is missing, so some achievements may be inaccurate.