Here is the full list of all 24 Operation Red Dragon achievements.
Buy ammo
Watch the benchmark
Upgrade your damage
Buy the regeneration perk
Buy the Stamina perk
Buy the tank perk
Get to wave 50
Find or get a gold weapon
Find the music box
Play the map Haven
Play the map Siberia Mansion
Play some music to calm down
Play the map Slaughter
Play the map Utopia
Use the weaponbox
Look at the credits in game.
Get to wave 20
Get to wave 40
Kill over 10 000 enemies
Kill over 100 000 enemies
Play the game for 5 hours
Play the game for 50 hours
Survive one game for over 1.5 hours
Finish the map Labyrinth