Here is the complete list of unlockable achievements in Ace Combat: Assault Horizon for the Xbox 360.
There is one secret achievement listed at the bottom.
Ace of Aces (30) – Obtain an A rank for every mission (free mission)
Aerial Sniper (20) – Use DFM to destroy 10 airborne enemies in competitive online
All Rounder (30) – Obtain all MVPs
Bail Out (20) – Escape from a dangerous situation
Berserker (20) – Eliminate your enemies to open a path for your allies
Bomber Master (10) – Fly a bomber and eliminate a large number of hostiles
Category 5 (20) – Chase the enemy through a hurricane
Chain Master (20) – Master the assault chain and take down hostiles one by one
Checking In (10) – Fly through the hotel gates
Critical Hit (25) – Take down a hostile fighter with a charged homing missile
Defender of World Heritage (20) – Provide close-range aerial support to wipe out hostile ground forces
Diverse Strikes (15) – Defeat hostiles with all 3 of the gunship’s weapons
Eagle Eye (20) – Successfully focus on 3 targets
Emergency (20) – Deal with an emergency situation
Fearsome Guardian (20) – Protect allied ground forces with the gunship’s firepower
Fire Hazard (20) – Pass through an explosion and destroy the enemy
Formation Attack (20) – Join the same DFM with two others and shoot down a hostile (mission co-op)
Friendly Fire (20) – Perform a risky move to save your friend
Ground Pounder (20) – Use ASM to destroy 30 ground enemies in competitive online
Guardian (20) – Thwart your enemy’s plans and return alive
Gun Master (15) – Massacre hostiles as the door gunner
Guns Guns Guns (20) – Destroy 5 hostile vehicles with helicopter gunfire
Hard Strike (20) – Wipe out hostile ground forces with ASM
Hot Pit (20) – Defend the allied base
Interceptor (20) – Use an attack helicopter and destroy 10 missiles or bombs in competitive online
Life Saver (20) – Use an attack helicopter to rescue the captured pilot
Limbo (10) – Fly beneath a falling chimney
Machine Gun Faithful (10) – Use the standard machine gun to defeat an enemy
Nice Assist (10) – Use DFM support or ASM support to join a flight member
Nice Kill (30) – Shoot down many hostile players in competitive online
Nice Save (10) – Save an ally being targeted by hostile players in competitive online
Nick of Time (20) – Prevent the launch of ICBMs by infiltrating the enemy base in a stealth bomber
One Million Tons of Scrap Metal (20) – Weave through a hostile fleet’s defense and rescue the hostage
Patriot (20) – Defend the capital
Pursuit Master (20) – Successfully pursue 3 enemies with counter maneuvers
Shot Master (20) – Take down 5 hostiles with a direct shot
Smooth Flight (20) – Protect allied transports from being shot down during landing
Speed Demon (10) – Eliminate the enemy threat to fighters as quickly as possible
Stay On Target (20) – In a helicopter, obtain (zoom in) and destroy 10 enemies
Steel Hunter (20) – From a helicopter, support the special forces while they suppress hostile vessels
Successive Kill (20) – Take down 3 hostiles in a row with an assault chain
Switch Master (25) – Successfully switch from defense to offense 10 times with counter maneuvers
The Collector (20) – Pilot all of the aircraft in the game
Total Annihilation (20) – Eliminate all bombers and prevent the use of a weapon of mass destruction
Veteran Pilot (20) – Play for an extensive amount of time in competitive online or mission co-op
Warwolf 1 (50) – Clear all missions
Warwolf Squadron (30) – Clear all levels in mission co-op
Welcome to Mission Co-Op (20) – Clear 1 level in mission co-op
World Tour (30) – Play on all maps in competitive online
Here is the only secret achievement you can unlock in the game.
Calamity (10) – Used Trinity to wipe out the enemy (free mission)