Here is the full list of all 20 Dark Traveller achievements.
Get all achievements
Get all Recondite Last Words
Upgrade a piece of equipment to highest level
Gaining the quantum backpack
Complete the first Time Leap
Gaining the Spacetime Rewinder
10 deaths
Upgrade a piece of equipment
Kill 500 enemies
Destroy 100 turrets
Get all secret research
Detonate the atom bomb and destroy the world
The number of Pulse RPG Ammo reaches 999
Collect all head ornaments
Collect all backpacks
Upgrade all equipment to highest level
Find the intelligent body
Collect all holographic memory fragments and find the real destination
Start all the altars and bring about Doomsday
Arrive at blissful space