Here is the full list of all 14 The Unwelcomed achievements.
It's the little things in life...
Completed your first puzzle room!
Completed your second puzzle room!
Find and pick up any single bear.
Completed your third puzzle room!
Find and pick up all 10 bears hidden throughout the game.
Find and pick up 3 bears in various rooms.
Find and pick up 5 bears in various rooms.
Completed the fourth puzzle room!
Completed the tutorial apartment.
Completed the seventh puzzle room!
Completed the sixth puzzle room!
Completed the fifth puzzle room!
Find and pick up 8 bears in various rooms.