Here is the full list of all 17 CONCLUSE achievements.
Use the linker book to travel back to the Docks.
Discover the hidden sewer.
Take the boat from the dock back to Cordova.
Beat the entire game.
Get the plow started.
Call home at every phone booth.
Unlock the safe in the sewer management room.
Bring the rat back to life by reattaching it's head.
Look through the binocular in Cordova three times.
Find and play the floppy disk.
Start a new game for the fifth time.
Start a new game for the second time.
Watch all three of the VHS tapes.
Solve the clock puzzle.
Check on the old lady in the subway.
Call mom at every phone booth.
Call Carolyn at every phone booth.