First players to reach 99 in each skill:


Attack   Blob   February 27, 2009   See rest
Defence   Blob   October 22, 2009   See rest
Strength   Blob   August 5, 2009   See rest
Constitution   Blob   August 5, 2009   See rest
Ranged   Blob   March 31, 2011   See rest
Prayer   Blob   December 15, 2010   See rest
Magic   Blob   December 15, 2010   See rest
Cooking   Blob   February 27, 2009   See rest
Woodcutting   Blob   April 9, 2011   See rest
Fletching   Blob   October 22, 2009   See rest
Fishing   Blob   July 6, 2011   See rest
Firemaking   Blob   August 24, 2010   See rest
Crafting   Blob   April 22, 2011   See rest
Smithing   Blob   May 31, 2011   See rest
Mining   Blob   February 11, 2012   See rest
Herblore   Blob   March 11, 2011   See rest
Agility   Blob   January 29, 2012   See rest
Thieving   Blob   January 30, 2012   See rest
Slayer   Blob   February 13, 2010   See rest
Farming   Blob   February 22, 2012   See rest
Runecrafting   Blob   February 19, 2012   See rest
Hunter   Blob   June 5, 2011   See rest
Construction   Blob   July 14, 2011   See rest
Summoning   Blob   April 7, 2010   See rest
Dungeoneering   Blob   March 10, 2012   See rest
Divination   Blob   November 12, 2013   See rest
Invention   Blob   January 27, 2016   See rest
Archaeology   TBD   See rest


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