Dungeon of the Endless
29 Achievements
1,000
100-120h
Xbox One
Xbox Series
What's Behind Every Door?
Open each door in each floor in a winning game.
50
2.26%
How to unlock the What's Behind Every Door? achievement in Dungeon of the Endless - Definitive Guide
Izzy5496
TrueAchievements
TrueAchievements
For this achievement you do not need to actually open every single door yourself as when you grab the crystal when you want to exit, the doors will begin to open themselves. You just need to wait for the message to pop that all the doors have been opened on the floor before pressing 
to leave with the crystal.
I found that this had already happened by the time I got the crystal to the exit as I mostly tried to open as many doors as I could until I felt my defences were no longer holding up!
You can check all doors have been opened also by pressing
to look at the floor map as you can get spammed with messages at the end. Any red lines on the wall outlines mean that there is an unopened door still.
to leave with the crystal. I found that this had already happened by the time I got the crystal to the exit as I mostly tried to open as many doors as I could until I felt my defences were no longer holding up!
You can check all doors have been opened also by pressing
to look at the floor map as you can get spammed with messages at the end. Any red lines on the wall outlines mean that there is an unopened door still.
mikehasabat
TrueSteamAchievements
TrueSteamAchievements
I got this without actually opening all doors myself. Instead, I waited at the elevator of each floor with the crystal and clicked Exit only after monsters opened the remaining doors.
Stratege
stratege.ru
stratege.ru
This guide was translated automatically.
Quite a difficult achievement, especially on the last floors. I recommend trying to complete this achievement using either the Escape Pod or the Armory Pod, as these capsules have virtually no negative effect.
It is also best to use a tactic with an outpost and one of the fastest heroes who opens the doors. Choose a room with a large number of slots for modules, place the whole team there and the attack and support modules you need. One hero runs through the rooms, opens them, and then runs back to his friends.
In general, you should make it a habit to open all rooms on all floors, at least the first 8-10, before leaving the floor. This way you will receive more resources and upgrade buildings faster; problems can only begin on the last floors, because there in the last rooms you can often run into such a crowd of enemies that they will tear your team apart in a matter of seconds.
It is also best to use a tactic with an outpost and one of the fastest heroes who opens the doors. Choose a room with a large number of slots for modules, place the whole team there and the attack and support modules you need. One hero runs through the rooms, opens them, and then runs back to his friends.
In general, you should make it a habit to open all rooms on all floors, at least the first 8-10, before leaving the floor. This way you will receive more resources and upgrade buildings faster; problems can only begin on the last floors, because there in the last rooms you can often run into such a crowd of enemies that they will tear your team apart in a matter of seconds.
