Brink

Achievement Guide:
There are 32 mission specific audio logs and 42 'common' (or shared?) audio logs, for a total of 74. Each mission/level awards 2 specific audio logs -- one is for simply winning the mission, and the other is for satisfying all of the primary objectives. The 'common' audio logs are awarded when the mission specific audio logs have already been awarded (ex: replaying a mission/level), or when the objective requirements haven't been met (ex: failed to defend one or more of the objectives but still won).

You will obtain most of the audio logs while going for several other achievements (completing the story lines, what if missions, Tough as nails, etc.), so leave this one for the clean up.

The most commonly missed audio logs are the ones that require that you 'shut out' the opponent by successfully defending the first objective. This can sometimes be tricky in co-op/versus play, so setting up custom freeplay games (1 vs 0) on those maps and simply letting the clock run out will usually suffice to mop up those pesky audio logs.

Additionally, keep in mind that it is possible to jump into a co-op/versus game where one or more of the offensive objectives had already been completed, so running through those levels on custom freeplay will allow you to confirm that you did indeed satisfy all of the objectives when you win the mission/level.

Finally, objectives that seem to be mutually exclusive do not have to be satisfied explicitly...

Example #1: you do not have to actually "Disable the Bot" on "Chopper Down" (Resort, Security) if you are able to "Defend the Pillar". Satisfying "Defend the Pillar" by shutting out the enemy will get you both audio logs (or doing shut-out twice in custom freeplay).

Example #2: you can get both audio logs on "Day 7: Attack on CCity" (Container City, Resistance) without actually satisfying the "Disable the Maintenance Bot" objective. If you manage a shut-out by satisfying "Defend the Gate" and the bot hasn't come around at that point, you will still get both audio logs (or doing shut-out twice in custom freeplay). Although you can switch sides to bring the bot forward in custom freeplay, it has been confirmed that it is not required for the audio log to be awarded.

List of mission specific audio logs:

Security
Day 1: Hostage Rescue (Aquarium, Security):
- Founder Barbara Elmhurst #1: Encrypted personal journal 02/08/44
- Founder Barbara Elmhurst #2: Encrypted personal journal 04/28/44 Pt 01
Day 3: Smash and Grab (Terminal, Security):
- Founder Barbara Elmhurst #3: Encrypted personal journal 04/28/44 Pt 02
- Founder Barbara Elmhurst #4: Encrypted personal journal 06/30/44
Day 4: Dirty Bomb (Container City, Security):
- Founder Barbara Elmhurst #5: Encrypted personal journal 07/12/44
- Founder Barbara Elmhurst #6: Encrypted personal journal 09/29/44
Day 5: Prison Break (Security Tower, Security):
- Founder Barbara Elmhurst #7: Encrypted personal journal 11/25/44
- Founder Barbara Elmhurst #8: Encrypted personal journal 01/16/45
Day 6: Early Launch (Shipyard, Security):
- Founder Barbara Elmhurst #9: Encrypted personal journal 02/24/45
- Founder Barbara Elmhurst #10: Encrypted personal journal 03/09/45
Day 8: Fallout (Reactor, Security):
- Founder Barbara Elmhurst #11: Encrypted personal journal 03/19/45
- Founder Barbara Elmhurst #12: Encrypted personal journal 03/28/45
Chopper Down (Resort, Security):
- Founder Barbara Elmhurst #13: Encrypted personal journal 04/01/45
- Captain Clinton Mokoena #1: Encrypted personal journal 03/27/43
Grand Theft Aero (Refuel, Security):
- Captain Clinton Mokoena #2: Encrypted personal journal 12/08/44
- Captain Clinton Mokoena #6: Encrypted personal journal 03/21/45

Resistance
Day 1: Getting Answers (Aquarium, Resistance):
- AWU Secretary Joe Chen #3: Encrypted personal journal 07/23/43
- AWU Secretary Joe Chen #4: Encrypted personal journal 08/12/43
Day 2: Breakout (Security Tower, Resistance):
- AWU Secretary Joe Chen #13: Encrypted personal journal 11/21/44
- AWU Secretary Joe Chen #15: Encrypted personal journal 02/12/45
Day 3: Chen's Plans (Terminal, Resistance):
- AWU Secretary Joe Chen #16: Encrypted personal journal 02/15/45
- AWU Secretary Joe Chen #19: Encrypted personal journal 03/25/45
Day 6: Black Box (Resort, Resistance):
- AWU Secretary Joe Chen #17: Encrypted personal journal 03/19/45
- AWU Secretary Joe Chen #18: Encrypted personal journal 03/23/45
Day 7: Attack on CCity (Container City, Resistance):
- AWU Secretary Joe Chen #9: Encrypted personal journal 02/19/44
- AWU Secretary Joe Chen #6: Encrypted personal journal 11/08/43
Day 8: Airborne (Refuel, Resistance):
- AWU Secretary Joe Chen #5: Encrypted personal journal 10/27/43
- AWU Secretary Joe Chen #1: Encrypted personal journal 02/18/43
Operation Babel (Shipyard, Resistance):
- AWU Secretary Joe Chen #11: Encrypted personal journal 11/09/44
- AWU Secretary Joe Chen #14: Encrypted personal journal 01/11/45
Critical Reaction (Reactor, Resistance):
- AWU Secretary Joe Chen #7: Encrypted personal journal 12/09/43
- AWU Secretary Joe Chen #2: Encrypted personal journal 07/12/43

The story line missions names are shown in bold, the freeplay level names are shown in parenthesis).

Notes:
- you are awarded 1 audio log per win when playing solo, both in campaign or freeplay (even custom 1 vs 0 freeplay games);
- you are awarded 2 audio logs per win when playing campaign online (co-op or versus);
- any audio logs not specifically listed above can be obtained on any mission/level, even the same one played over and over;
- you can change sides as needed in custom freeplay;
- audio logs are not awarded for the challenges (you can get them all without playing a single challenge mission);
- audio logs are not campaign dependent (you can get them all in freeplay without playing a single campaign mission);
- audio logs are not awarded for leveling, nor are they level dependent (you can get any of them with a rank 1 char);
- audio logs are not tied to a single character (i.e. you can use all 10 of the char slots to collect them);
- secondary objectives are not relevant to the audio logs (you can get all of the audio logs without ever completing a single secondary objective).

EDIT: full list of all audio logs and mission objectives can be found on my Brink Notes page.

An Audio Log is unlocked when you win a match, either in Campaign or Freeplay. Finishing Challenges does NOT count for this achievement. If done solo, you unlock one audio log at a time. If done in versus or co-op, you unlock two at a time.

I would advise not going for this straightaway; you will earn audio logs as you complete the game, finish the missions on Hard, and progress to Rank 5. However, once you've finished these other achievements, it can be difficult to get the last few audio logs.

Set up a private Freeplay game with no bots and play the defense side in each mission. Your goal is to defend the very first objective until the timer runs out, earning you a specific audio log for doing so. The defense team is as follows:

Aquarium: Resistance
Container City: Resistance
Shipyard: Resistance
Terminal: Resistance
Security Tower: Security
Reactor: Security
Refuel: Security
Resort: Security

Once you have these eight audio logs added to your collection, keep playing matches in any mode you enjoy until you get all 74. You can check your progress at any time by going into the Dossier from the main menu screen. Enjoy!

::Edit:: it is important to note that this does NOT need to all be done on one character. I got these audio logs across three separate characters. Thanks to DeviousJedi for pointing this out!

(Please leave a comment if you down-vote so that I can improve my solutions! Thanks!!)

this achievement is very EASY :)

I played all campaign missions including what-if missoes in online versus. After I finished the game it still missing 13 audio logs and it´s not always possible to know that audio log corresponds to each mission. Basically you have to do all the primary objectives on both teams, security and resistance. I tried to make all possible secondary objectives, i´m not sure but i don´t think you need to do them.



Select FREEPLAY > PRIVATE GAME

GAME MODE - Objective
PLAY MODE - Solo
MAP - All
MATCH SETTINGS - Diffiuclty EASY
Min Team Size 0
Max Team Size 1

To select these definitions you'll play all the maps alone without any enemy , so you won´t loose much time. Sometimes you start on security team and other times on resistance team ,so you have to play and complete objectives. Next time you will play the same map but on another team. If it doesn´t happen quit the game and start again until you play the map with both teams.

I get the achievement in the fifth map REACTOR , So I didn't need to play all maps.
I do not know if you have to play online versus to get audio logs but I think this method works to get all of them.


NOTE VERY IMPORTANT

In the map CONTAINER CITY if you play with RESISTANCE you have a primary objective which is called " DISABLE THE MAINTENANCE BOT ".You have to disable the bot before another primary objective ends. The problem is that there is a gun on the floor near the bot that kills you when you approach it
. A way to overcome this obstacle is going to the left and shoot the bot far away until he become disabled. Probably this won´t take more than 2 or 3 minutes.



Hope that helps.

For all of the non mission specific audio logs there is an easy way to do it.

Go to freeplay (and set it to private),
set game mode to objective,
set play mode to solo,
set map to shipyard.
Then in the matchsettings set min team size to 0 (so there are no bots),
set max team size to 1,
put force team balancing off.

And after you have done this just start up the game and be on the security side. Run trough this mission and you should have a audio log at the end.

Keep replaying this mission and you should have all the non mission specific audio logs in no time (yeah not that much time hehehe).

You can also do this with a buddy so you get 2 audio logs at the end of the mission. Just set maximum players to 2 in the match settings and set the playmode to versus(and yeah you can still be on the same team). Remember that you need to invite your buddy to the game because it is set to private.