Here is the full list of all 18 The Seeker achievements.
Buy all the weapons
Die 100 times
You've healed a broken heart to get his revenge!
You've explored a moon, and made a big dent in it! Congrats!
Complete Departure without being damaged and triggering alarm
Complete Mighty without being damaged and triggering alarm
You just wasted 4 WATS of energy doing nothing...
Disable over 150 alarms
Hack over 50 terminals
Collect over 500
You have opened over 100 tunnels!
Complete Vallar without being damaged and triggering alarms
Hack 20 terminals
Die 5 times on the same map
Disable over 50 enemies
Travel over 1000
Good job... You broke the frikin game
Pass the tutorial