Level 1

Hunting Logs: Unlocked on completion of level 1 class quest.

Level 5

Level 10

Armoury System:

Class change unlocked on completion of first level 10 class quest.

Level 14

Step Dance Emote:

Unlocked on completion of Good for What Ales You sidequest in Limsa Lominsa.

Ball Dance Emote:

Unlocked on completion of Help Me, Lord of the Dance sidequest in Ul'Dah.

Harvest Dance Emote:

Unlocked on completion of Saw That One Coming sidequest in Gridania.

Level 15

Sastasha Dungeon Access:

Unlocked during It's Probably Pirates Main Storyline Quest.

Challenge Log:

Unlocked upon completion of the Rising to the Challenge sidequest. Available after completing Call of the Sea Main Quest.

Dye System:

Unlocked upon completion of Color Your World sidequest.

Aesthetician System:

Unlocked upon completion Beauty Is Only Scalp Deep sidequest. Available after completing Call of the Sea Main Quest.

Party Finder System:

Unlocked after completing Sastasha (note: this does not automatically become available at level 15 like many guides indicate).

Hall of the Novice:

Unlocked on completion of It's Probably Pirates Main Storyline Quest or by talking to a Smith NPC located at the Adventurers' Guild in each city.

Level 16

The Tam-Tara Deepcroft Dungeon Access:

Unlocked during Fire in the Gloom Main Storyline Quest at level 16.

Duty Roulette: Leveling:

Unlocked when more than one dungeon is unlocked.

Level 17

Copperbell Mines Dungeon Access:

Unlocked during Into a Copper Hell Main Storyline Quest.

Retainer Access:

Unlocked upon completion of the The Scions of the Seventh Dawn Main Storyline Quest.

Level 19

Ability to extract Materia from gear:

Unlocked upon completion of the Forging the Spirit sidequest.

Ability to meld Materia onto gear:

Unlocked upon completion of the Waking the Spirit sidequest.

Level 20

Sightseeing Log:

Unlocked upon completion of the A Sight to Behold sidequest.

Halatali Dungeon Access:

Unlocked during Hallo Halatali Sidequest.

Level 22

Mount Speed increase to all lower level areas: middle La Noscea, lower La Noscea, Central Shroud, East Shroud, western Thanalan, central Thanalan; unlocked after Brotherly Love Main Storyline Quest.

Level 24

Level 25

Advanced Materia melding:

Unlocked upon completion of the Melding Materia Muchly sidequest.

Level 28

Haukke Manor Dungeon Access:

Unlocked during Skeletons in Her Closet Main Storyline Quest.

Level 29

White Wolf Gate Access:

Unlocked on completion of Broadening Horizons sidequest.

Level 30

Job Specialization:

Unlocked on completion of level 30 class quests.

PvP Access:

Unlocked upon completion of the "A Pup No Longer" quest (Immortal Flames, Maelstrom, Twin Adder).

Chocobo Companion Access: Unlocked upon completion of the My Feisty Little Chocobo sidequest. Extended to chocobo raising upon completion of the Bird in Hand sidequest.

Desynthesis:

Unlocked upon completion of the Gone to Pieces sidequest.

Level 32

Level 33

Mount speed increased in eastern La Noscea after completion of In the Company of Heroes Main Story Quest

Mount speed increased in upper and outer La Noscea after completion of Lord of Crags Main Story Quest

Level 34

Level 35

Mount speed increased in eastern Thanalan after completion of Eyes on Me Main Story Quest

Level 36

Treasure Hunting:

Unlocked upon completion of the Treasures and Tribulations sidequest.

Throw Emote:

Unlocked on completion of Toss Fit Workout sidequest.

Level 38

Level 41

Kobold Quests:

Unlocked starting with Highway Robbery sidequest.

Mount speed increased in the Coerthas central highlands after completion of In Pursuit of the Past Main Story Quest

Level 42

Sylph Quests:

Unlocked starting with Seeking Solace sidequest.

Mount speed increased in western La Noscea after completion of History Repeating Main Story Quest

Level 43

Level 44

Level 46

Mount speed increased in Mor Dhona after completion of Every Little Thing She Does Is Magitek Main Story Quest

Level 47

Adventurer Squadrons:

Unlocked on completion of one of the Squadron and Commander Grand Company quests.

Level 49

Cape Westwind (Trial) Trial Access:

Unlocked during Operation Archon Main Storyline Quest.

Level 50

Talan's sale of of Master Crafting Tomes, Tools, Gear, and Items for DoH/DoL classes unlocked via the Just Tooling Around sidequest.

Dyeable Artifact Armor:

Dyeable versions of artifact armor obtainable upon completion of Simply to Dye For sidequest.

Level 50 (Recommended iLevel ~45 to ~55)

The Hunt:

Unlocked upon completion of the applicable Let the Hunt Begin sidequest.

Castrum Meridianum Dungeon Access:

Unlocked during Rock the Castrum Main Storyline Quest.

The Praetorium Dungeon Access:

Unlocked during The Ultimate Weapon Main Storyline Quest.

Mount speed increased in northern Thanalan, Mist, the Lavender Beds, and the Goblet, after completion of The Ultimate Weapon Main Story Quest

Level 50 (Recommended iLevel ~55 to ~65)

Pharos Sirius Dungeon Access:

Unlocked during Sirius Business sidequest.

Thornmarch (Hard) Trial Access:

Unlocked during the You Have Selected Regicide Main Scenario Quest.

Level 50 (Recommended iLevel ~65 to ~75)

The Howling Eye (Hard) Trial Access:

Unlocked during In for Garuda Awakening Chronicles of a New Era Quest.

The Navel (Hard) Trial Access:

Unlocked during In a Titan Spot Chronicles of a New Era Quest.

Level 50 (Recommended iLevel ~75 to ~85)

The Binding Coil of Bahamut Access:

Unlocked during Primal Awakening Chronicles of a New Era.

The Howling Eye (Extreme) Trial Access:

Unlocked during the Gale-force Warning Chronicles of a New Era quest.

The Bowl of Embers (Extreme) Trial Access:

Unlocked during the Ifrit Ain't Broke Chronicles of a New Era quest.

Frontline Access: Unlocked upon completion of the "Like Civilized Men and Women " quest (Immortal Flames, Maelstrom, Twin Adder).

Level 50 (Recommended iLevel ~85 to ~95)

Snowcloak Dungeon Access:

Unlocked during The Path of the Righteous Main Storyline Quest.

Duty Roulette: Level 50 Dungeons:

Unlocked on completion of all level 50 dungeons.

Duty Roulette: Trials: Unlocked on completion of two or more trials in roulette.

Level 50 (Recommended iLevel ~95 to ~105)

The Chrysalis Access:

Unlocked during the An Uninvited Ascian Main Storyline Quest.

Level 50 (Recommended iLevel ~110+)