Here is the full list of all 28 Stella Voyager achievements.
Got a DON for the first time
Owned 1,000,000 DON
Owned 100,000,000 DON
A total of lost 100,000,000 DON
Got a SunStone for the first time
Owned 30 SunStones
A total of lost 10 SunStones
Got all the engines
Got all the barriers
Upgraded any weapon to maximum level
Got all overdrive systems
Got all the assist modules
Visited 10 Planets
Visited 50 Planets
First construction
A total of 100 facilities were made
Obtained 10 Proofs of Trust
Obtained 50 Proofs of Trust
Trade more than 100 items at once
Trade more than 500 items at once
Destroyed 1,000 enemies
Destroyed 100 enemy bosses
Defeated Kamui for the first time
First wreck
Wrecked 50 times
Reached the end of the universe
Found a black hole
Reach the Event Horizon