Gathered All The Knowledge (2.4%) 'Gathered All The Knowledge' achievement icon

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:trophy: Guide written by a human:

Collect all 11 orbs of knowledge.

It can be done in multiple runs. However, if you get a high-damage wand, a teleport wand, and a good digging wand, you can get all the orbs in one run while digging outside the biomes with minor interaction with enemies. The exception is Volume VIII, which is located in The Work (Hell), which is protected by a thick layer of lava.

The lava layer can be bypassed by using the Freeze Field perk or spell, which also helps to fight the lava-bleeding enemies.

Another approach is to aquire Essence of Earth from the ??? room in the East wall of the map and find the Essence Eater in Snowy Wasteland or Desert. After destroying that orb the Tannerkivi item will be dropped, which will turn any material into dirt, which is not the most efficiant way to dig, but it will allow you to reach all orbs.

A complete list of orbs can be found on the Noita wiki Orbs of True Knowledge page and navigating with the help of the map (major spoilers)