If you have trophy/save data from Assassins Creed, Assassins Creed 2, and/or Assassins Creed 3 on your system, you will receive the main protagonists costume from those games.
Robe
How to unlock
Altair Robes
Have Assassins Creed data on your system.
Cat Outfit
Go to any general store and buy the animal pelts needed to craft it.
Connor Robes
Have Assassins Creed 3 data on your system.
Ezio Robes
Have Assassins Creed 2 data on your system.
Hunter Outfit
Go to any general store and buy the red howler monkey skin (5,000R) & white jaguar pelt (6,000R). Craft the outfit.
Mayan Outfit
Collecting the 16 Mayan Stones that you get from finishing each of the Mayan Stelae missions, followed by opening up the secret door in Tulum.
Stealth Outfit
Finish half the Assassin Contracts in the game.
Templar Outfit
Collect (mine)keys from finishing each of the 16 Templar Hunt missions, followed by opening up the cage in the Great Inagua hideout.
Charge Ram attack
Defeat all four legendary ships.
Easy "Killer Killer" trophy
If desired, get harpoon upgrades, harpoon storage, strength, and extra armor to make this process easier. Sail to a Killer Whale hunting location (for example, coordinates 537, 340 on the world map). After a deck hand announces the presence of a whale, Kenway will be sent with a harpoon to hunt it. Harpoon the whale and follow it, being careful when it dives. It will eventually surface again on the horizon and run at your boat. Harpoon it again to avoid taking damage. Repeat the process until the whale's health is taken down to unlock the trophy.
Easy "Redingote Up!" trophy
Go to a General Store, then select the "Hunting Goods" tab. Purchase the Red Howler Monkey Skin for 5,000 R and White Jaguar Pelt for 6,000 R. Select the "Crafting" tab at the main menu, then choose the "Hunting Outfit" option.
Giant squid attack
Swim inside the Antocha shipwreck at coordinates 630,660. While looking out one of the windows you will be able to see a giant squid take down a whale.
In-Game Outfits
Outfit
How to unlock
Altaïr Ibn-La'Ahad Outfit
On the system you're playing on you have to have Uplay data from 1 prior Assassin's Creed game.
Connor Kenway Outfit
This is Edward Kenway's Grandson's Assassin's Creed 3 Outfit. To unlock: on the system you're playing on you have to have Uplay data from 3 prior Assa.
Edward The Legend Outfit
Play Assassin's Creed 4 Singleplayer in Edward's authentic pirate outfit. Unlocks for 20 Uplay Points.
The Blades of Toledo Pack
Slay your enemies with the Blades of Toledo in Singleplayer, and unlock exclusive Multiplayer Profile items. Unlocks for: 30 Uplay Coins.
The Vengeful Daughter Pack
Unlock the Multiplayer Lady Black's Vengeful Daughter costume, and additional items for the Jackdaw. Unlocks for 40 Uplay Points.
Mayan puzzle locations
Complete all Mayan puzzles at the indicated location to unlock the Mayan Outfit at Tulum (coordinates 72, 404).
Symbol #1: Great Inagua; completed during DNA Sequence 4, Memory 1.
Symbol #2: Cat Island (coordinates 736, 692)
Symbol #2: Mantanzas (coordinates 340, 643)
Symbol #4: Cape Bonavista (coordinates 180, 594)
Symbol #5: Tulum (coordinates 71, 402)
Symbol #6: Pinos Isle (coordinates 337, 475)
Symbol #7: Pinos Isle (coordinates 344, 476)
Symbol #8: Tortuga (coordinates 875, 379)
Symbol #9: Long Bay (coordinates 524, 255)
Symbol #10: Isla Providencia (coordinates 503, 45)
Symbol #11: Isla Providencia (coordinates 505, 43)
Symbol #12: New Bone (coordinates 434, 113)
Symbol #13: Misteriosa (coordinates 302, 120)
Symbol #14: Misteriosa (coordinates 295, 197)
Symbol #15: Santanillas (coordinates 214, 244)
Symbol #16: Santanillas (coordinates 224, 243)
Shipwreck locations
The following underwater shipwrecks can be found at the indicated location after Sequence 6-1 is completed.
Spend the indicated amount of points in your Uplay account to earn the corresponding reward.
500 Reales: 10 points.
Edward the Legend outfit: 20 points.
The Blades of Toledo and exclusive multiplayer items: 30 points.
The Vengeful Daughter Outfit for multiplayer, customize the Jackdaw with epic items: 40 points.
Various Cheats
If you finish enough Abstergo challenges - as below - you will unlock the named cheats. They can be found in the Cheats option in the Abstergo Challenges menu. Note: You cannot earn Trophies or save the game while these are in use.
Unlockable
How to unlock
Armed to the Teeth
Finish 90 Abstergo Challenges.
Arrr Matey!
Finish 20 Abstergo Challenges.
Celestial Navigation
Finish 10 Abstergo Challenges.
Dead Men Tell No Tales
Finish 70 Abstergo Challenges.
Deceased Crew
Finish all 100 Abstergo Challenges.
Loaded to the Gunwhale
Finish 50 Abstergo Challenges.
No Quarter
Finish 30 Abstergo Challenges.
Poseidon's Will
Finish 60 Abstergo Challenges.
Scourge of the Seven Seas
Finish 40 Abstergo Challenges.
Shiver Me Timbers
Finish 80 Abstergo Challenges.
Various Trophies
Complete the following tasks to unlock PlayStation 3 trophy rewards.
Trophy
How to unlock
A New Hope (Silver)
Complete memory sequence 9.
A Pirate's Life For Me (Bronze)
Complete memory sequence 3.
Adrift (Silver)
Complete memory sequence 8.
All Aboard! (Bronze)
Board a ship without losing any crew members.
All Rounder (Bronze)
Play on every game mode, and use every ability and ranged weapon once in Multiplayer.
Barfly (Silver)
Unlock all taverns.
Been Down So Long... (Silver)
Complete memory sequence 11.
Bunker Buddies (Bronze)
Complete present day mission 4.
Business And Pleasure (Bronze)
Earn 50,000 reales.
By The Book (Silver)
Complete 100% of all main mission constraints.
Cannon fodder (Bronze)
Recruit 500 crew members.
Cartographer (Bronze)
Visit every location of the game.
Committed To The Cause (Bronze)
Reach level 55 in Multiplayer.
Death Of A Salesman (Silver)
Complete memory sequence 5.
Destroyer (Silver)
Fully upgrade the Jackdaw.
Devil Of The Caribbean (Silver)
Defeat all 4 legendary ships.
Employee Of The Month (Bronze)
Complete 25 Abstergo challenges.
Excavator (Bronze)
Find a buried treasure.
FTFY (Bronze)
Fully upgrade your hideout.
Getting Weird Around Here (Bronze)
Complete present day mission 3.
Ghost In The Machine (Bronze)
Hack 15 computers in Abstergo Entertainment.
Good While It Lasted (Bronze)
Complete memory sequence 2.
Help A Brother Out (Bronze)
Complete a Templar Hunt sequence.
Heroes Aren't Born (Bronze)
Complete memory sequence 1.
Hungover (Bronze)
Wake up in a haystack.
It's All Good (Bronze)
Complete present day mission 5.
Just Like Starting Over (Silver)
Complete memory sequence 12.
Killer Killer (Bronze)
Harpoon a killer whale.
King Of The Castle (Silver)
Capture all forts.
Lab Technician (Bronze)
Play and complete a game session of Game Lab in the Multiplayer Public playlist.
Master Of The Caribbean (Bronze)
Complete the Discovery Mode of Wolfpack in Multiplayer.
Mer-man (Bronze)
Swim a total of 1 nmi.
Mixing Up The Medicines (Silver)
Complete memory sequence 6.
My Elusive Fortune (Silver)
Complete memory sequence 10.
No Apologies (Bronze)
Complete memory sequence 4.
Owned (Bronze)
Complete every activity in a single location.
Personal Bag Of Tricks (Bronze)
Finish a game session with an ability set that you customized in Multiplayer.
Prizes, Plunder, and Adventure! (Platinum)
Win every trophy.
Redingote Up! (Bronze)
Craft the Hunter outfit.
Roped In (Bronze)
Perform 5 air assassinations from a swinging rope.
Routine Hacking (Bronze)
Complete present day mission 2.
Saw That One Coming... (Gold)
Complete memory sequence 13.
Sea Legs (Bronze)
Complete all naval contracts.
Seven Deadly Seas (Bronze)
Explore all underwater shipwrecks.
Sharing Is Caring (Bronze)
Share each type of discovery with friends once.
Silence, Fool! (Bronze)
Kill a guard ringing a bell.
Siren Song (Bronze)
Rescue pirate hostages by distracting enemies with "dancers."
