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