Every skill levels 1 to 99 by doing it, on RuneScape's XP curve. Each page lists what its levels unlock.
Attack
Hitpoints
Mining
Strength
Agility
Smithing
Defence
Herblore
Fishing
Ranged
Thieving
Cooking
Prayer
Crafting
Firemaking
Magic
Fletching
Woodcutting
Runecraft
Slayer
Farming
Construction
Hunter