Ace Combat X: Skies of Deception

Unlock Bronze Ace
Destroy 200 Enemies.

Unlock Expert Marksman
Destroy 50 Aircraft with Guns.

Unlock Eye of the Storm
Defeat the Gleipnir.

Unlock Freedom Tower
Liberate Griswall.

Unlock Gold Ace
Destroy 1000 Enemies.

Unlock Land Guardian
Keep allied casualties at Stand Canyon to a minimum.

Unlock Mark of the Vioarr
Defeat the Fefnir.

Unlock Marksman
Destroy 5 Aircraft with Guns.

Unlock Sea Guardian
Keep damage to the allied fleet at Terminus Island to a minimum.

Unlock Sharpshooter
Destroy 15 Aircraft with Guns.

Unlock Silver Ace
Destroy 500 Enemies.

Unlock SP Stage "Operation X"
Complete all missions and mission branches.

Unlock Stage 03B "Captive City"
Complete 05 or 06 before going to 04.

Unlock Stage 07C "Time Limit"
07->09->11->07C.

Unlock Stage 12C "Wild Card"
07->08->10->09->12C.