A Life of Adventure I - Paragon's Crown
A Life of Adventure II - Warlord's Crown
A Life of Adventure III - Dynasty Crown
A Life of Adventure IV - Amaro Horn
A Life of Adventure V - Migratory Plume

It's the mount that's out of place in the achievement rewards, though "Migratory Plume" just doesn't have the same feeling as the original Crowns. Did they run out of good names to pick?