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