Here is the full list of all 49 Top Gun: Hard Lock achievements worth 1,000 gamerscore.
Complete mission 11 - Off Mission
Destroy 10 bunkers
Destroy an enemy aircraft with guns while barrel rolling
Win a co-op mission with at least one other player
Complete a Danger Close objective without damaging any allies
Buzz the tower in five different missions
Destroy 25 armoured vehicles
Complete mission 06 - High Value Targets
Destroy 100 aircraft
Complete any campaign mission without dying, after being below 25% health
Score 10 "Assist" bonuses for damaging an aircraft that an ally destroys
Destroy 5 enemies with a single shot
Spend more than 5 minutes flying within 200m of the ground
Complete mission 04 - Alert Five
Destroy 5 bombers by destroying their engines with guns
Destroy 25 aircraft using only guns
Destroy 25 aircraft in Hard Lock mode
Destroy 25 aircraft using missiles
Perform 100 barrel rolls
Successfully evade 10 missiles in a row
Win 10 hard lock manoeuvres in a row
Defeat Maverick in mission 02 - Best Of The Best
Destroy 5 target drones
Destroy 25 aircraft
Score 10 "Payback" bonuses for destroying the last player who killed you
Score 10 "Close Quarters" bonuses for destroying aircraft within 1000m
Replay any campaign mission and improve your score
Buzz the tower in any mission
Spend more than 5 minutes flying with afterburner activated
Get a Kill Streak of 5 in a Deathmatch or Team Deathmatch game
Successfully evade a missile
Complete mission 01 - Welcome To The Gulf
Make a successful landing on your first attempt in any mission
Destroy 5 aircraft
Get your first air-to-air combat kill
Complete mission 14 - The Big One
Complete bonus mission - You Can Be Mine
Complete any Danger Zone mission
Win the trophy in mission 12 - TOPGUN
Complete all stealth sections in the game without being detected
Get silver or gold stars on 10 campaign missions
Get gold stars on all 15 campaign missions
Score 10 "Got Your Six" bonuses for destroying a target on your ally's tail
Score 10 "Got Your Frag" bonuses for destroying a target an ally has engaged
Destroy a super-manoeuverable aircraft while flying an attack aircraft
Fly a total of 20,000km
Fire every weapon in the game at least once
Fly every aircraft in the game at least once
Reach Fleet Admiral rank