Oxenfree

There are a total of 13 Maggie Adler Letters available in the game, and they appear as a small white sparkle on the ground. You can hear information about them on 140.1FM, but the code is very hard to decrypt. It is necessary to get far enough in the game that you unlock the new radio and automatically get Maggie Adler Letter #13. While going for these letters, you should also go for 12 anomalies in order to unlock:


A video guide showing all 25 collectibles available in Oxenfree can be found below:
0:12 - Maggie Adler Letter #13 - Main Street
0:54 - Maggie Adler Letter #4 - Main Street
1:20 - 105.1 Anomaly - Epiphany Field
1:44 - Maggie Adler Letter #1 - Epiphany Field
1:58 - Open Estate Gate
2:02 - 100.3 Anomaly - Discovery Cliffs
2:29 - Maggie Adler Letter #6 - Discovery Cliffs
2:42 - Maggie Adler Letter #12 - Beacon Beach
2:56 - 102.3 Anomaly - Epiphany Field
3:36 - Maggie Adler Letter #3 - Harden Tower
4:04 - Maggie Adler Letter #11 - Towhee Woods
4:41 - 103.5 Anomaly - Towhee Woods
5:26 - 99.9 Anomaly - Bridge Stand
5:57 - Maggie Adler Letter #8 - Bridge Stand
6:05 - 101.1 Anomaly - Bridge Stand
6:45 - 91.5 Anomaly - Camp Grounds
7:21 - Maggie Adler Letter #9 - Camp Grounds
7:44 - 97.9 Anomaly - Camp Grounds
8:28 - 106.7 Anomaly - Relay Point
8:56 - Maggie Adler Letter #10 - Relay Point
9:09 - 89.9 Anomaly - Facilities
9:40 - Maggie Adler Letter #5 - Facilities
9:56 - 94.3 Anomaly - US Army RCS
10:23 - Maggie Adler Letter #7 - US Army RCS
10:31 - 104.7 Anomaly - Milner Outpost
10:47 - Maggie Adler Letter #2 - Milner Outpost

You will also unlock:

When you reach a certain point in the game, you'll obtain a "special radio" with a longer dial that allows you to find "radio beacons" hidden around the island. Every one of these secret stashes contains one of the 13 Maggie's Letters. The exact point where this starts is

and it has a point of no return, that is when you

In order to find the letters, you'll have to tune your radio to 140.1, and a voice will give a little clue about where the letter is located.

They aren't hard to find, and a little shining light marks the letter location as you get near, but as these audio clues aren't subtitled and they are given using the NATO alphabet (you know, Charlie, Alpha, Tango, Zulu, etc), it could be troublesome for non native english speakers.

So here's a list of all the 13 letters. You must find them all in the same playthrough. The first one is automatically obtained as part of the story, and every location has one except for Adler Estate, and Main Street has two, counting the automatic one. You can get them in the order you want after you got the first one, but I'll also add the letter number as they appear in the menu, in case somebody is missing a certain one (thanks tobiasvl).

1 - Main Street (Letter #13) - Obtained automatically along with the "special radio" inside the Parks And Facilities Office, as a part of the main story.


2 - Main Street (Letter #4) - In front of the Guest Information Centre, located in the parking lot that is near the boat pier.

IMPORTANT: As hxc Frankie said, for some people, letter #4 is located in front of the Antiques Shop, which is the small building left of the Parks And Facilities Office. As the audio clue talks about antiques, I guess this should be the real location.


3 - Discovery Cliffs (Letter #6) - Near the brown coloured zone in the top part.


4 - Beacon Beach (Letter #12) - At the bottom of the stairs, near the fence that blocks the cave entrance.


5 - Epiphany Fields (Letter #1) - In front of the lighthouse, near the left border of the zone.


6 - Harden Tower (Letter #3) - In the last bend of the path that leads to the tower.


7 - Towhee Woods (Letter #11) - In front of the fallen tree, bottom right.


8 - Bridge Stand (Letter #8) - In the small graveyard, bottom left of the screen.


9 - Camp Grounds (Letter #9) - In the ruined lookout point, top left of the screen.


10 - Relay Point (Letter #10) - In front of the water well.


11 - Milner Outpost (Letter #2) - At the bottom of the ladder of the water tower.


12 - Facilities (Letter #5) - In the room with three beds, bottom left of the screen.


13 - US Army RCS (Letter #7) - In front of the direction signpost, left of the big tiger painting.


Leading to this achievement, that requires all 13 letters, you'll also get:

Please, for the best use of the video.
1 - Turn on automatic subtitles in portuquese.
2 - Then post to translate automatically into English.
3 - Enjoy the video.

letters Part 1.

letters Part 2.

Letters Part 3.

Letters Part 4.


Walkthrough playlist - Gameplay complete.
https://www.youtube.com/playlist?list=PLwstSupty_EjUBhZ-HHCq...

Achievements Guide - Oxenfree - Detonado 100%

Guia de Conquista em Português do Brasil.