When you have completed the main storyline collect the following Pivots to unlock the corresponding Animus Hack at the 'Options' menu.
Theta Pivot (assassinate enemies during open combat).
Made of Steel:
Iota Pivot (unlimited health).
Lambda Pivot (disables guard detection and investigation).
Omicron Pivot (unlimited Recruit Tokens).
Tau Pivot (toggle summer and winter).
Kappa Pivot (disables reload times).
Sun and Moon:
Eta Pivot (toggle day and night).
Upsilon Pivot (causes a lightning strike when you make a kill).
Sigma Pivot (change the weather).
Added by: Sanzano May 14th 2013, ID#5323