Full list of all 23 Super Space Serpent SE achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Get the Double Gun
Get the Blurred upgrade
kill 1000 enemies
play the game 10 times
Get the monochrome upgrade
kill 100 enemies
Get a life upgrade
Killed your first 10 enemies
Get killed
Kill your first enemy
Unlocks when you play Super Space Serpent SE for the first time
Get the Triple Gun
Beat the first Boss
Finnish the game
Played 100 times
Played the game 50 times
get to the 2 boss
Get hit
Defeat the first world
Defeat the second world
Defeat the third world
Defeat all the worlds
Get to the third boss