Guild challenges (Revelations)

Guild Challenges are a feature re-introduced from Assassin's Creed: Brotherhood. Now, in Assassin's Creed: Revelations, their main difference is that instead of completing challenges to move up ranks, players have to complete certain challenge sets in order to unlock specific items or abilities. Challenges cannot be completed while in Cappadocia.

Set 1
Reward: Assassins will be more effective when sent on missions. (Chances to succeed in Mediterranean Defense missions are increased by 10%; only applied to the first Assassin chosen)
 * Call Assassins during a fight 25 times.
 * Call Assassins on a target 20 times.

Set 2
Reward: Assassin Signal recharges at an increased speed.
 * Use Arrow Storm 15 times.
 * Call your Assassins within a story mission at least 5 times.

Set 3
Reward: Unlocks the Assassin Faction weapon, the Sword of Altaïr.
 * Recruit 12 Assassins.
 * Train 7 recruits to the rank of Master Assassin.
 * Successfully perform a Den Defense 3 times. (note that you can also unlock this if you assign Den Masters to each of the dens in Constantinople and get each of them to the rank of Master Assassin)

Set 1
Reward: Cost of hiring Mercenaries decreases.
 * Use Mercenaries on Guards 10 times.
 * Destroy 5 scaffolds by throwing someone into it.
 * Kill 5 enemies using a thrown weapon.

Set 2
Reward: Unlocks the Mercenary Faction Ability.
 * Disarm and kill a guard with his own weapon 5 times.
 * Kill 25 Byzantine Almogavars.
 * Perform 10 hook and throws.

Set 3
Reward: Unlocks the Mercenary Faction weapon, the Broadsword
 * Perform 10 Double Assassinations.
 * Kill 5 Guards in under 10 seconds in melee combat.
 * Perform 10 Combo Kill streaks of at least 5 Kills.
 * Kill 25 Ottoman Janissaries.

Set 1
Reward: Cost of hiring Romanies decreases.
 * Use 10 Romanies on guards.
 * Escape from at least 10 guards using stealth or hiding spots.
 * Kill 20 guards with a Crossbow without being detected.

Set 2
Reward: Unlocks the Romanies Faction Ability. (When the guards make some of your romanies go away, they blow Datura Poison at the guards)
 * Use 10 tactical bombs to escape guards.
 * Kill 5 stalkers without getting stabbed.
 * Kill 15 guards using poison.

Set 3

 * Kill 20 guards with bombs without being spotted.
 * Assassinate 10 guards from behind.
 * Assassinate 5 guards from hiding spots.
 * Kill 3 guards dazed by a single smoke bomb.

Reward: Unlocks the Romanies' Faction weapon, the Romani Stiletto.

Set 1
Reward: Cost of hiring Thieves decreases.
 * Use 10 Thieves on guards.
 * Sprint uninterrupted for 300 meters.
 * Perform 15 Hook and Runs.

Set 2
Reward: Unlocks the Thief Faction Ability. (the thieves will steal money from people and loot dead guards)
 * Perform 40 Leaps of Faith.
 * Climb a total distance of 1 KM.
 * Steal 250 Akçe with Counter Steals.

Set 3
Reward: Unlocks the Thief Faction weapon, the Ottoman Mace.
 * Perform a dive of at least 30 meters.
 * Kill 25 guards with Throwing Knives.
 * Perform 5 Air Assassinations from a beam to a guard.
 * Perform 10 Zipline Assassinations.

Set 1
Reward: Extra Bomb ingredients found from Assassin Dens.
 * Stick 10 bombs on guards.
 * Kill a Mission Target with a bomb.
 * Distract 20 guards with bombs.
 * Kill 5 guards with a single bomb.
 * Kill 20 guards with Tripwire Bombs.

Set 2
Reward: Bomb Capacity upgrade. (1 extra bomb space for each pouch)
 * Craft a bomb with every shell type.
 * Use 50 bombs.
 * Kill 25 guards incapacitated by bombs.
 * Craft 1 bomb with every effect type.
 * Use every bomb effect at least twice.

Assassins

 * Calling Assassins multiple times during the same fight counts towards calling them 25 times.
 * To recruit more than eleven Assassins, you can highlight a city in Mediterranean Defense and manage the guild by stationing an Assassin there, freeing up slots in Ezio's private guard.
 * To unlock Den Defense: first get your Templar Awareness full then do enough illegal actions to cause the Byzantines to attack one of your dens. The fastest way is to restore few shops right after you took over a Templar Den without lowering your Templar Awareness first.
 * One way to complete the Den Defense challenge is to replay Sequence 2, Memory 6, "On the Defense". The Den Defense carried out in this mission is much easier than subsequent attempts.

Mercenaries

 * Throwing civilians into scaffolds also counts towards the challenge.
 * Killing 25 Almogavars can be achieved by repeatedly playing the bomb memory Piri Reis: Datura.
 * It is advisable to finish the killing streak challenges before the end of Sequence 2, since the guard will be consist of Agiles and Elites which all vulnerable to streak kills. It is possible to obtain after Sequence 2, but with the Janissaries included in each patrol, the job will be trickier. The best odd in finishing this achievement is by stirring up troubles at Imperial District Harbor, since there are at least two or three spots where two patrol meets; giving you at least 8 guards to face at the same time.

Romanies

 * 5 Stalkers can be killed by repeatedly replaying The Janissaries memory. A Stalker always appears in the Grand Bazaar area. One also appears in The Deacon, Part 1 and Part 2 memories.
 * In the Italian version of the game there is a translation bug that says you have to kill 20 guards with the Hidden Blade. Despite of that, the challenge is actually scripted to be fulfilled with the Crossbow only.

Thieves

 * Sprinting 300 meters can easily be accomplished in Topkapı Palace courtyard.
 * Diving 30 meters can be achieved by leaping off a ship's mast in the Arsenal district. There is also a chance to do this challenge when Ezio retrieve Sofia's package in South Harbor after Ezio scare away Duccio de Luca. Simply climb the ship's mast after retrieving Sofia's package then jump to the water, this will also gave you a stealthy exit to complete the optional memory objective.

Bombs

 * Sticking 10 bombs and killing 20 guards with tripwire bombs can easily be accomplished by sticking smoke bombs on a group of guards, before placing yourself between them and laying down a datura tripwire bomb.
 * Sticking 10 bombs and killing 25 guards incapacitated by bombs can be easily accomplished by sticking smoke bombs on a group of guards, then tossing a splinter impact bomb on them.
 * To complete the challenge for crafting one bomb of each effect, you must make bombs with all 10 effects (shells and powder do not matter) and quick craft them. To quick craft bombs, open the weapon selection menu during gameplay, highlight the bomb and hit the 'Add Bomb' button. Stay near a crafting table when you do this so that you can easily go back and make another bomb with another effect. After you quick craft with all 10 effects, you will complete the challenge.
 * Kill 20 guards with Tripwire Bombs. to do that you have to use two types of bombs. First you have to place the Tripwire bomb and use a sound decoy to attract guards.