Achievement reward never received.

Time:About 12:30am UTC-06:00 Central time NA
Frequency:Once can not be repeated.
World name:Faerie
Character name:Inia Sestina
Retainer name:None
NPC name:None
Monster name:None
Class/Level:Astrologian Lv60
Party or solo:Party
In-game time:
Area and coordinates:
Housing:
Steps:
1.Completed the Achievement for the 500 player commendations.
2.Never received my reward gilded magitek armor.
3.It's been 4 days now cleared my mail and tried everything else I can think of with no luck I want my mount please I earned it.

You need to talk to Jonathas in Apkallu Falls in Old Gridania to claim your achievement rewards. The game tells you this after earning your first achievement.