Not sure if it has been aggregated, but here is my effort, mostly collected from official sources, and a few other articles for larger draft context, etc. I'll skip Villa and Lampard, for obvious reasons.
NYCFC acquires Jeb Brovsky from the Montreal Impact (6/12/2014) (by trading 2nd round pick in the 2016 MLS SuperDraft)
NYCFC Acquires Goalkeeper Josh Saunders (7/10/2014)
Andrew Jacobson joins NYCFC (7/29/2014) (from FC Dallas in exchange for NYCFC’s highest pick in the third round of the 2016 MLS SuperDraft)
NYCFC Sign Kwame Watson-Siriboe (8/11/2014) (in exchange for NYCFC’s natural pick in the fourth round of the 2016 MLS SuperDraft)
New York City FC to Pick Second in Today's Dispersal Draft (11/14/2014)
MLS:
From Dan Kennedy to Caleb Calvert, your guide to upcoming Chivas USA Dispersal Draft (11/18/2014)
New York City FC Acquires Matthew Dunn in Dispersal Draft (11/19/2014) (second overall pick in MLS Dispersal Draft)
New York City FC Acquires Defender Josh Williams from Columbus Crew (12/8/2014) (in exchange for allocation money)
MLS:
Vancouver Whitecaps trade Omar Salgado to New York City FC, with move to international club pending (traded to NYCFC and then transferred to Tigres UANL for money)
SB Nation:
NYCFC look to have done better than Orlando City in the MLS Expansion Draft (12/10/14)
Ned Grabavoy, Real Salt Lake
Patrick Mullins, New England Revolution
Jason Hernandez, San Jose Earthquakes
Daniel Lovitz, Toronto FC
Tony Taylor, New England Revolution
Mehdi Ballouchy, Vancouver Whitecaps
George John, FC Dallas
Thomas McNamara, DC United
Sal Zizzo, Sporting Kansas City
Chris Wingert, Real Salt Lake
Daniel Lovitz Moves to Toronto FC (12/10/2014)
New York City FC Brings in Meara in Exchange for Zizzo (12/11/2014) (Meara on loan; Zizzo to NYRB permanently)
New York City FC sign Akira Fitzgerald (12/11/2014) (acquired out of contract)
New York City FC clinch Velasquez signing (12/19/2014) (from Real Salt Lake in exchange for allocation money)
New York City FC sign USMNT’s Mix Diskerud (1/13/2015) (on a free transfer, using their number one position in the Allocation Ranking)
Khiry Shelton Joins NYCFC (1/15/2015) (second overall pick of the MLS SuperDraft)
Orlando Sentinel:
Check out the full list of MLS SuperDraft picks (1/15/2015)
New York City FC Signs Ecuadorian Defender Andrés Mendoza (1/15/2015)
New York City FC Acquire Midfielder Kwadwo Poku From Atlanta (1/23/2015) (transfer)
New York City FC Sign Slovakian International Adam Nemec (2/2/2015)
New York City FC sign Colombian midfielder Javier Calle (2/6/2015)
(season-long loan agreement with an option to purchase)
New York City FC signs draft pick Connor Brandt (2/26/2015) (second pick of the 2015 MLS SuperDraft)
New York City FC sign veteran midfielder Pablo Alvarez (3/6/2015)
Shay Facey joins New York City FC on loan (3/6/2015) (from Manchester City until June 30, 2015)
New York City FC Sign Goalkeeper Eirik Johansen (3/31/2015) (product of the Manchester City Academy)
New York City FC Sign Defender RJ Allen (5/2/2015)