Full list of all 45 Crimson Dragon achievements worth 1,500 gamerscore. It takes around 25-30 hours to unlock all of the achievements in the base game.
The base game contains 33 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 12 achievements worth 500 Gamerscore.
Achieved player level 40
Completed all story missions on Classic difficulty
Completed all story missions on Casual or Classic difficulty
Achieved player level 20
Completed all missions for Forest, Ancient Ruins, and Lava Lake on any difficulty
Defeated 3 enemy bosses
Completed all missions for Coral Lake East, Coral Lake West and Underground Lake on any difficulty
Achieved player level 10
Purchased 3 dragons from the shop
Collected 500 beacons
Evolved your first dragon
Scored an "A" rank during a mission in Classic mode
Achieved player level 5
Killed 2000 enemy creatures
Collected 18 different Antibodies from creatures on Draco
Fired 3000 tracking missiles
Used 10 Ampoules
Purchased 1 Item Pack using credits or Jewels
Killed 200 enemies using only your dragon's secondary skill
Killed 500 enemy creatures
Unlocked a new skill by feeding your dragon
Looted 1 rare item and 25 common items
Earned a mission medal playing on any difficulty
Activated your wingman dragon communicator and issued a voice command
Killed 200 enemies using only your dragon's main skill
Used 1 Ampoule during a mission
Used voice commands to navigate to the Shop, Inventory, and Dragon Roost
Scored "C" rank or higher on a mission in any difficulty mode
Started your first mission with Icarus Division
Used a Regenerator to revive your dragon during a mission
Killed 50 enemy creatures
Performed a barrel roll by leaning left or right
Acquire all medals for every story mission in the game
Multiplayer: Defeated the White Phantom 3 times
Multiplayer: Scored "S" rank 3 times
Multiplayer: Cleared mission 25 times.
Multiplayer: Completed all multiplayer missions on any difficulty
Multiplayer: Completed 5 multiplayer missions
Multiplayer: Completed 1 multiplayer mission
Achieved player level 50
Used 25 regenerators to revive your dragon during missions
Collected over 2,000,000 in credits in your account
Defeated bosses 10 times in "S" rank.
Killed 10000 enemy creatures
Used 100 ampoules