Here is my Walkthrough to earn this Achievement. The 2 Videos above show one possibility. I will offer you a other possibility, maybe its for you the better and faster Way? Some Facts before i little explain how to get this Achievement with my Way.
Time: 07:22:04
Points: 59946
S Ranking incl the Cassette Tape for the Information Achievement. No Cuts and no Checkpoint reloading.
In my Way i run on the left Side of the Map to Palitz, tranquilize all 3 Enemies (Palitz, + 2 Guards) and let them lie on the Ground. Then I go further to the Base (left Hand). through the red Door left and then i climb up to the Guardtower and tranquilize again all 3 Enemies (Glaz + 2 Guards)
Pickup Glaz and go back the same way I came (free! you can running!). Call the Chopper and extract both at the Startingpoint from the Mainstory Mission.
Where Palitz lie on the Ground is a Armory and inside is the Cassette Tape (Chicos Tape #6). When i bring Palitz to the Chopper, i collect this Tape and save one Playthrough.
Question about this Walkthrough? Ask me!
regards