Here is the full list of all 45 Omega One achievements.
Killed a total of 50 boss ships
Reached the level cap of 50
Killed a total of 25 boss ships
Reach Level 20
Unlocked Ship: Wasp
Killed a total of 10 boss ships
Played 1v1 for the first time
Won a 1v1
Unlocked Ship: Galactica
Unlock weapon: Plasma
Unlock weapon: Flak
Reach wave 20
Killed A total of 1000 Ship Enemies
Unlock weapon: Cannon
Killed a total of 5 boss ships
reach level 10
Unlocked Ship: Tonic
Unlock weapon: Needler
Reach wave 15
Killed A total of 500 Ship Enemies
Reach level 5
Unlocked Ship: Hornet
Unlock weapon: Spreader
Killed A total of 250 Ship Enemies
Score 20000 points
Reach wave 10
Pickup a total of 100 power up drops
Score 9000 points
Killed A total of 100 Ship Enemies
Killed A total of 50 Ship Enemies
Reach level 2
Unlocked Ship: Razor
Posted your first online score
Died for the 1st time
Score 5000 points
Killed your first boss
Reach wave 5
Pickup a total of 10 power up drops
Score 1000 points
Pickup your first power drop
Check out SSS on Youtube
Check out SSS on Facebook
Check out SSS on Twitter
Viewed the high-score table
Started the game (for stats purposes)