Me and a friend were willing to get all the achievements of this game, but after going through all endings on multiple runs, we realized we were missing one — Episode 4 : The Heritage — "it should have been unlocked the first time we finished the game", we thought.

So, after a bit of trial and error this is what we learned:

▪ First, you need to complete the fuse box puzzle on the last room, this guide won't help you with that;
▪ If you need help with any puzzle, check this Walkthrough Guide.

▪ At least 1 friend is needed for "Are you ok there buddy?" achievement;
▪ Each achievement is credited to the player who performed the action;
▪ "Exclusive" means you can't get both achievements on the same run.

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Episode 4 : The Heritage
Complete the transfer chamber.
▪ Exclusive: Yes (with "The blood line ends here" & "Over your dead body!");

▪ Hints: Unlocks when you push the green lever.

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The bloodline ends here
Deliberately take out the entire mansion, and whatever may be lost with it.
▪ Exclusive: Yes (with "Episode 4: The Heritage" & "Over your dead body!");

▪ Hints: Unlocks when you push a red lever.

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I am Gladsbury
Become the professor of the Gladsbury Estate.
▪ Exclusive: Yes (with "Are you ok there buddy?" & "Over your dead body!");

▪ Hints: Unlocks when you lay on the transfer machine.

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Are you ok there buddy?
Witness another player complete the transfer.
▪ Exclusive: Yes (with "I am Gladsbury");

▪ Hints: Unlocks when your co-op lays on the transfer machine.

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Over your dead body!
Reject the will and your inheritance.
▪ Exclusive: Yes (with "The blood line ends here", "Episode 4: The Heritage" & "I am Gladsbury");

▪ Hints: Unlocks when you leave on the elevator.

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I hope this guide helped you achieve all the endings. If you found it useful, consider giving it a thumbs up, leaving a comment or even awarding it!