Here is the full list of all 25 Henry Mosse and the Wormhole Conspiracy achievements.
Find all spiders
Give coffee to Bouncer
Help Dorothy
Deal with that nasty fruit fly
Assist the Antoids
Complete your first Far-Star delivery
Sneak onto the Mosse ship
Get into the party!
Get kicked out of the Aquaduct
Reunite with old family
Obtain a rare crystal
Complete the incredible machine
Get captured
Complete the game
Show Vendy that she is loved
Recite a poem of perfect drama and romance
Listen to Maax's origin story
Ensure Spflornk heard his favourite music
Pass all of Edutron's tests
Give profit pet plushie to the Gamer
Throw plushie at the satellite
Make the bouncer let you in to the bar
Give dung to the fruit fly
Bribe the Wrangler