The Talos Principle
40 Achievements
1,000
25-30h
Split Personality
Communicate with your double.
30
1.85%
How to unlock the Split Personality achievement in The Talos Principle - Definitive Guide
Also, it's a very clever touch by the designers that whatever message you choose to write, when you read it on the wall it is actually a response to your own message!
eg. I wrote 'Am I the only one around here that thinks for themselves?'
But when I read it, it says 'Actually, you are the one who is designed to think you are thinking for yourself!'
Mind. Blown. 😮😮😮
Excellent game by the way!
Video guide
This my video solution using the strategy outlined by Lathanar - slight difference in my game as the paint bucket was to the left of the purple door, but otherwise, a great strategy. You don’t see the achievement pop because I didn’t use a capture card.
Text guide
As you are teleported into C2, you are directly in front of a religious building facing a purple door. Walk towards this door and on the ground to the left of the door is a paint bucket. Grab it then do a 180 and immediately to your right is the puzzle “A Ditch and A Fence”.
In this puzzle, walk up to the recorder and place the paint bucket on the ground to the right of it. Start the recorder, grab the bucket and walk up to the wall left of the blue barrier to paint your message (I chose the last option). Go back to the recorder to end/play your recording and then look at/read the QR code that “you” just painted.
If you haven’t already, doing this should also unlock Leave Your Mark.
Take a bucket of paint in to a level with the Self Co-Op machine, (they're the only things other than yourself that will go through a purple field). Start the recording mode and paint a QR code.
Go back to the machine, start the playback mode, read the QR code "you" paint.
Achievement will unlock when you read the QR code.
Earliest opportunity: B4 (quit and reload if the paint doesn't appear)
Note: This does not consume a paint bucket.
This is gonna be a little bit of an RNG game. Basically you have to be in a Level that has a Recorder puzzle AND a bucket of white paint laying around. They spawn randomly and there is no set way of forcing one to appear. After finding a paint bucket, go into the puzzle that has a recorder with the bucket in hand, activate the recorder and go paint a QR code on a wall while being recorded and wait 5 seconds. End the recording and go read the QR code your ghost has painted. Using every bucket of paint you find DOES reduce the amount of buckets found later on, but from what I've researched it's not too bad. One level I tried that always had a bucket of paint for me to repeat the trophy was World C-7. There is a bucket to your left around some broken walls next to an audio log, pick that up and head into the recorder puzzle behind you.
Another level that I noticed should have a bucket in it is Star World B. There should be a bucket to your left around the corner, there is also a recorder puzzle here too.
Note that the paint buckets respawn if you leave the puzzle hub and return, so this achievement is not missable.
https://www.youtube.com/watch?v=_rb8MCnsR4o