Side memories were memories of ancestors that could not be exactly determined in the timeline as historical event. As a result, side memories were optional missions that could be accessed at any time through the Animus.
When Altaïr Ibn-La'Ahad was hunting the nine Templars, he also saved citizens who were being abused by the guards, climbed towers and tall buildings to access viewpoints for a tactical advantage, as well as collected flags of the varying factions during the Third Crusade.
Ezio Auditore da FirenzeEdit
When Ezio Auditore da Firenze set out to avenge the death of his family, he also did the following: beat up unfaithful husbands; participated in races against other free-runners; completed assassination contracts for Lorenzo de' Medici; couriered letters across cities; visited viewpoints and Templar lairs; took seals from tombs of old Assassins; collected the statuettes of Roman gods and goddesses; renovated Monteriggioni and collected feathers to commemorate his fallen brother. He also tore down wanted posters, bribed heralds and killed witnesses to reduce his notoriety.
During his time in Rome, Ezio continued to complete assassination contracts – this time for Niccolò Machiavelli – and collect feathers, but in addition to those he also began to liberating Rome from the Borgia by saving citizens, renovating Rome and assassinating key Templar supporters. He also destroyed the war machines created by Leonardo da Vinci for the Borgia and dispersed a secret cult named the Followers of Romulus. Following this, Ezio completed many assignments for the city's thieves, courtesans and mercenaries. Knowing that he could not take down the Borgia alone, he started to recruit people into the Assassin Order and sent them on [contracts throughout Europe. At certain moments during his time in Rome, he relived repressed memories of Cristina Vespucci.
When Ezio later visited Constantinople in search of the Masyaf Keys, he recaptured the Assassin Dens which were taken over by the Templars and earned all of Piri Reis's bombs. Just like he did in Rome, he recruited Assassins and trained them into Master Assassins over time – he also sent them to various parts of the Mediterranean and slowly eroded Templar rule. Accompanying this, Ezio renovated some buildings in Constantinople and defended Assassin Dens from Templar attacks, collected Ishak Pasha's memoir pages and found his location of hidden armor, as well as finding rare copies of books to give them to Sofia Sartor for reprinting. Through this he found many secret locations, aiding his efforts for the Masyaf Keys.
During the third Golden Age of Piracy, Edward Kenway collected sea shanties for his crew, freed and saved pirates, upgraded the Jackdaw, interacted with Mayan stelae and unearthened keystones, and killed Templar agents for their keys to open an armor located at Great Inagua. Using the Jackdaw, Edward captured forts and completed naval contracts, and in order to help the Assassins, he completed assassination contracts to kill Templars and cruel slave masters.
During the time of the Seven Years' War, when the Templar Shay Cormac was set out to hunt down Assassins, he also collected blueprints to upgrade his ship, the Morrigan. He inspected cave paintings, collected sea shanties, and he also was on the search for war letters. To scale down the Assassin influence throughout the Atlantic, River Valley and New York, he also took over Assassin-affiliated gang headquarters. To fortify, he took over settlements or forts, just like Edward. When liberated from the Assassins, Shay could spent money on renovating buildings. Shay also would counter Assassins by intercepting their pigeons, which were used to assign assassination contracts. Shay then would go and protect the target, killing those who would try to harm said target.
In addition, Shay would also find keys to help him getting new outfits. When done collecting Viking swords, a Viking grave would be marked on the map, and Shay could obtain a Viking outfit. He could also find Templar relics within buried treasures. These treasures could be found by collecting treasure maps. He could also inspect native pillars, who were hiding totems. These could also be used to obtain outfits.
During the American Revolutionary War, Ratonhnhaké:ton collected Benjamin Franklin's almanac pages, collected feathers and located Captain Kidd's treasure. He freed the North American trade routes from pirates, expanded the Davenport Homestead and mapped out the underground tunnel networks which were used by the Freemasons. He then liberated the districts of Boston and New York from Templar control, hunted down dangerous beasts, disproved myths created by the Frontiersmen and beat up champions of the Boston Brawlers.
In the alternate-reality created by the Apple of Eden, Ratonhnhaké:ton liberated convoys and found lucid memories in the Frontier, Boston and New York. He saved citizens from wolves, fed starving civilians and saved them from the bluecoats.