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.

Set 1
Reward: Assassins will be more effective when sent on missions. (Chances to succeed in Mediterranean Defense missions are increased; 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 courtesans 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.

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.

Thieves

 * Sprinting 300 meters can easily be accomplished in Topkapı Palace.
 * Diving 30 meters can be achieved by leaping off a ship's mast in the Arsenal district.

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.

Trivia

 * Attempting to complete any Guild Challenges will not work in Cappadocia.