Here is the full list of all 24 Spaceport Hope achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Kill 500 enemies
Find 10 chests
Go underwater
Find the island
Kill an enemy
Kill 100 enemies
Collect 1000 coins
Buy a weapon
Find a chest
Die 50 times
Collect 10000 coins
Unlock all the weapons
Explore all the world
Find the hacker hideout
Complete all the NPC quests
Talk to all NPCs
Update your main weapon
Unlock a new outfit
Buy a new ship
Assemble the ultimate weapon
Beat the final boss
Beat the final boss with only the 1st gun
Visit the about menu
Die in the tutorial level