Here is the full list of all 25 Galaxy Admirals achievements.
Use carrier ship's 'repel' ability to destroy unreachable enemy ship.
Play with friend 1 time
Detonate at least three mines with one shot.
Use carrier ship's 'attract' ability to destroy unreachable enemy ship.
Win in multiplayer 1 time
Win in multiplayer 10 times
Create and play PvP match 100 times
Deliver a total of 10 damage to enemy ships with one shot.
Send the invitation and play with the invited player 1 time
Send the invitation and play with the invited player 10 times
Send the invitation and play with the invited player 100 times
Teleport and destroy unreachable enemy ship.
Attach together at least four ships and move them.
Accept the invitation and play match 10 times
Destroy at least three enemy ships with one shot.
Destroy at least three crystals during one round.
Accept the invitation and play match 1 time
Create and play PvP match 1 time
Use carrier ship's 'change orbit' ability to destroy unreachable enemy ship.
Use the mirror to redirect the laser beam and destroy enemy ship.
Win in multiplayer 100 times
Accept the invitation and play match 100 times
Create and play PvP match 10 times
Play with friends 10 times
Play with friends 100 times