Here is the full list of all 29 Primordia achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Take a leap of faith
Fulfill your true mission
Stop Scraper once and for all
She pushed you too far
Resort to blackmail, and emerge the victor
Join your foe for the greater good
Reunite Surly Company
Finish the game with all possible robots.
Stay true to yourself
Unlock Horatio's past
Victory at what cost?
Unlock the tower door, without outside help
Find Memento Moribuilt
Change Factotum's mind
Help a lost pilgrim find his way
Find every entry in the information kiosk
Clean two gears using different methods
Unlock the courthouse
Get help from a new friend
Train Crispin for his big date
Pass a legal test on the first try
Use technology to do the impossible
Find the hidden tape deck
Wake a slumbering giant
Use brawn instead of brains
Pass Ever-Faithful's test on the first try
Look at all the sensor coordinates
That hit the spot. But for how much longer?
An easy solution to an impossible problem