Complete Campaign mode under the Realistic difficulty setting to unlock Veteran difficulty.
Red tiger camo skin for the AH64X:
Complete Squad Ops to unlock the Red tiger camo skin for the AH64X.
Easy completion of "Lord Of War":
On Lord Of War", the third mission, one of the objectives is to provide cover fire for your downed ally. The frequent RPG fire you will draw from the enemy infantry will make this tougher than it sounds. The best method is to use your missiles to destroy the surrounding buildings where most of the infantry spawn. Shoot the enemies with the FLIR view as they spawn, before they have a chance to move. This is also useful because most of the RPG soldiers fire from the rooftops. Thus, clearing out the buildings will significantly decrease the amount of RPG shots sent your way.
Flying Colors - Complete 'Takeoff' mission.
Locksmith - Unlock all chapters.
Wave Goodbye - Complete a specific mission objective in 'The Sky is Burning'.
Bridge Burner - Complete a specific mission objective in 'Whiteout' in Local Co-op mode.
Radio Silenced - Complete a specific mission objective in 'Over and Out'.
Drug Bust - Complete a specific mission objective in 'The River Deep' in Local Co-op mode.
Overwatch - Complete a specific mission objective in 'The Gang's All Here'.
Four Eyes - Complete a specific mission objective in 'Lord of War' in Local Co-op mode.
Crude Defender - Complete a specific mission objective in 'Sharks in the Water'.
Demolition Man - Complete a specific mission objective in 'Holidays in Hell' in Local Co-op mode.
Stopping Power - Complete a specific mission objective in 'Sunshine Units'.
Highly Survivable - Complete a specific mission objective in 'City on Fire'.
Point And Shoot - Complete a specific mission objective in 'On the X'.
Dominator - Win the 'Domination' mission in Squad Operations.
Ace Of Diamonds - Complete specific mission objective in 'A Diamond in the Rough'.
Chemical Killer - Complete specific mission objective in 'Rain in the Desert'.
Rigged With Explosives - Complete specific mission objective in 'Ship of Fools'.
A Leaf On The Wind - Complete 'A Damn Shame'.
Team Player - Win all Squad Operations in any flight mode.
Rumble in the Jungle - Complete specific mission objective in 'Turkey Shoot'.
Shot At Fame - Post scores to all Leaderboards.
Deadliest Home Videos - Watch a replay.
Hotshot - Kill 10 enemy infintry in FLIR view.
Touchdown - Complete a landing at a landing zone in Realistic or Veteran difficulty.
Ripple Effect - Kill 8 ground units with on Hellfire ripple shot.
See It, Shoot It - Enable setting 'Control Turret in Zoom' and kill 5 enemy infantry by gun in this mode.
New Veteran - Win any mission on Veteran difficulty.
Squadrowned - Win one Squad Operations mission in online Co-op mode.
What, No Roflcopter? - Complete free flight with each helicopter.
Big Brother Is Watching You - Use satellite view in each location.
Sticky Trigger Finger - Using the 30mm cannon, kill 20 enemy infantry without letting go of the trigger.
Peppy's Request - Do a barrel roll!.
Keeping It Real - Play one mission entirely in cockpit view.
Not A Scratch - Complete any mission without dying on any difficulty.
Gunfighter - Kill 30 enemy ground units with the 30mm camera.
Rocketman - Kill 70 enemy ground units with the Hydra 70 rockets.
Sting Like A Bee - Kill 9 enemy air units with the FIM-92 Stinger missiles.
I Can Dance All Day - Avoid 15 incoming missiles.
Skin Deep - Unlock all skins for all helicopters.
Bumper Stickers! - Unlock twenty decals.
Got To Da Choppa! - Start 'The Sky is Burning' mission.
This Is The End - Play the Credits.
Desert Striker - Finish Tazirstan Chapter on Realistic or Veteran difficulty.
Feet Wet - Finish Africa Chapter on Realistic or Veteran difficulty.
Jungle Striker - Finish Amazon Chapter on Realistic or Veteran difficulty.
Apache Of Two - Win any 3 missions from the Campaign in Local Co-op on any difficulty.
Hell Yeah - Kill 114 enemy ground units with the AGM 114 Hellfire missiles.
Rotorhead - Complete the Campaign.
Helicopterrific - Complete the Campaign and Squad Operations.
Second The Best - Complete all secondary objectives in Campaign mode.
You Complete Me - Earn all Bronze, Silver, and Gold trophies.