Here is the full list of all 42 The Solus Project achievements worth 1,000 gamerscore.
Find Milson
Swim far off shore
Fall for at least 5 seconds to your death
Jump into the Hotspot crater
Drink champagne 3 times
Reach the island of Hotspot
Enter the massive ice cavern
Enter the Ice Path
Complete Highpoint
Collect all secrets
Reach the island of Highpoint
Open 50 boxes
Dip your head in acid water
Complete the library
Collect 75 secrets
Show some love to rocks - smash 20 rocks together
Get hit by lightning while holding a hammer
Complete Flashpoint
Carry 10 pieces of Tower Pieces in your inventory
Have 16 rocks in inventory
Collect 50 secrets
Reach the island of Flashpoint
Have seen the dolls that cannot be unseen
Overcome the dark encounter
Start the Communication Tower
Find and pick up the music player
Get hit by a spike plant
Find the ladder down
Teleport 10 times in 30 seconds
Survive a tornado
Extinguish a torch in water
Complete your survival training
Explore the backside of the first island
Collect your first secret
Hasn't picked up PDA until 5 minutes has passed
Set foot on the planet
Return to the first caves after Flashpoint
Only eat alien 10 times in a row
Find the energy source
Blow up a torch in H2S without getting killed
Phone home
Return to the Crossroad Island with an energy source