There is an Alma Doll in every Interval in the game. Most Intervals have random spawn locations and so this achievement can require a bit more exploration. Use the "Doll Collector" Guide found HERE for the locations of each Alma Doll. Below is also a video with all possible doll locations. This achievement will pop once you've found the last doll you need.
If you are playing with a partner, you must get the Alma Doll before they do for the Challenge and this achievement.
If you intend to find the doll and then quit out you will need to reach an autosave location for the game to remember you finding the doll.
I don't know if people have noticed. But I think the Alma Dolls move. Not always in the same spot. When I played on Recruit mode. Then went back threw it. On INSANE mode. The dolls where in a different places. Maybe Difficulty level, or just random I don't know for sure.
Okay, I had the same problem a lot of people on here seemed to have, but I if you went through the game in Co-op, as I'm sure most of you did, it doesn't count if your partner picked up the doll; in every level YOU have to pick it up. Once I realized this, I went back to the two levels I hadn't gotten it myself, and it popped. Also, the second you get the doll, the word saving should appear. Once it is done saving, you can leave the level and go to the next. No need to go all the way through. I hope this helps.
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