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.
Die 50 times
Find the hacker hideout
Find the island
Buy a new ship
Collect 10000 coins
Find 10 chests
Go underwater
Kill 500 enemies
Buy a weapon
Kill 100 enemies
Collect 1000 coins
Visit the about menu
Kill an enemy
Find a chest
Unlock all the weapons
Explore all the world
Complete all the NPC quests
Talk to all NPCs
Update your main weapon
Unlock a new outfit
Assemble the ultimate weapon
Beat the final boss
Beat the final boss with only the 1st gun
Die in the tutorial level