Archaeologist Achievement in The Talos Principle II

There are multiple types of collectibles in this game, and none is missable to my knowledge. The game creates an autosave at the point of no return, so you can continue your save file and mop up any collectibles you've missed.

Some collectibles are simple and straightforward: the Lifthrasir and Trevor audio logs are marked on your compass as question marks. There is one per area, so just head to the question marks on your compass in each area, interact with the terminals, and download the associated audio logs.

The other collectibles - the Remnants of the Past and the human artifacts - are unfortunately not marked on your compass. There aren't set amounts of artifacts like there are with audio logs (some areas have none, some have one, some have two). For the Remnants, starting with area E3, all areas have two of them.

The walkthrough linked in the roadmap lists what collectibles are in each area, and videos are included for each area's collectibles. To avoid making the guide huge (with 12 videos here alone), please refer to the walkthrough HERE for each area's collectibles and a video.