My list updated to include June updates, I've tried to include as much info as possible.
HOPEFULLY this will be the last time I update this, as the end of the upgrade offer is near!!
Windows 7
Telemetry/Unnecessary:
KB2952664 - Compatibility update for Windows 7 SP1
https://support.microsoft.com/kb/2952664
KB2977759 - Compatibility update for Windows 7 RTM (Without SP1)
https://support.microsoft.com/en-us/kb/2977759
KB3021917 - Update to Windows 7 SP1 for performance improvements
https://support.microsoft.com/kb/3021917
KB3022345 - Update for customer experience diagnostic telemetry (superseded by KB3068708)
https://support.microsoft.com/en-us/kb/3022345
KB3035583 - "Get Windows 10" App (System Tray Nagware/Telemetry)
https://support.microsoft.com/en-us/kb/3035583
KB3068708 - Update for customer experience diagnostic telemetry (superseded by KB3080149)
https://support.microsoft.com/en-us/kb/3068708
KB3075249 - Update that adds telemetry points to UAC in Windows 7
https://support.microsoft.com/en-us/kb/3075249
KB3080149 - Update for customer experience diagnostic telemetry (replaces previous 2 CEDT updates)
https://support.microsoft.com/en-us/kb/3080149
KB3123862 - Updated capabilities to upgrade Windows 8.1 and Windows 7
https://support.microsoft.com/en-us/kb/3123862
KB3150513 - May 2016 Compatibility Update for Windows
https://support.microsoft.com/en-us/kb/3150513
KB3173040 - Windows 8.1 and Windows 7 SP1 end of free upgrade offer notification
https://support.microsoft.com/en-us/kb/3173040
Windows Update Client:
KB2990214 - Update that enables you to upgrade from Win7 to Win10
https://support.microsoft.com/en-us/kb/2990214
KB3050265 - Windows Update Client for Windows 7: June 2015
https://support.microsoft.com/en-us/kb/3050265
KB3065987 - Windows Update Client for Windows 7: July 2015
https://support.microsoft.com/en-us/kb/3065987
KB3075851 - Windows Update Client for Windows 7: August 2015
https://support.microsoft.com/en-us/kb/3075851
KB3083324 - Windows Update Client for Windows 7: September 2015
https://support.microsoft.com/en-us/kb/3083324
KB3083710 - Windows Update Client for Windows 7: October 2015
https://support.microsoft.com/en-us/kb/3083710
KB3102810 - Windows Update Client for Windows 7 - High CPU/Long Scan Fix
https://support.microsoft.com/en-us/kb/3102810
(Recommend installing KB3102810 if you have installed the previous Windows Update Client Updates)
KB3112343 - Windows Update Client for Windows 7: December 2015
https://support.microsoft.com/en-us/kb/3112343
KB3135445 - Windows Update Client for Windows 7: February 2016
https://support.microsoft.com/en-us/kb/3135445
KB3138612 - Windows Update Client for Windows 7: March 2016
https://support.microsoft.com/en-us/kb/3138612
KB3161608 - June 2016 Update Rollup for Windows 7 SP1 (Includes Windows Update Client for Windows 7: June 2016)
https://support.microsoft.com/en-us/kb/3161608
==================================================================
Windows 8/8.1
Telemetry/Unnecessary:
KB2976978 - Compatibility update for Windows 8/8.1
https://support.microsoft.com/en-us/kb/2976978
KB3022345 - Update for customer experience diagnostic telemetry (superseded by KB3068708)
https://support.microsoft.com/en-us/kb/3022345
KB3035583 - "Get Windows 10" App (System Tray Nagware/Telemetry)
https://support.microsoft.com/en-us/kb/3035583
KB3064683 - Windows 8.1 OOBE modifications to reserve Windows 10
https://support.microsoft.com/en-us/kb/3064683
KB3068708 - Update for customer experience diagnostic telemetry (superseded by KB3080149)
https://support.microsoft.com/en-us/kb/3068708
KB3072318 - Update for Windows 8.1 OOBE to upgrade to Windows 10
https://support.microsoft.com/en-us/kb/3072318
KB3075249 - Update that adds telemetry points to UAC in Windows 8.1
https://support.microsoft.com/en-us/kb/3075249
KB3080149 - Update for customer experience diagnostic telemetry (replaces previous 2 CEDT updates)
https://support.microsoft.com/en-us/kb/3080149
KB3123862 - Updated capabilities to upgrade Windows 8.1 and Windows 7
https://support.microsoft.com/en-us/kb/3123862
KB3173040 - Windows 8.1 and Windows 7 SP1 end of free upgrade offer notification
https://support.microsoft.com/en-us/kb/3173040
Windows Update Client:
KB3044374 - Update that enables you to upgrade from Win8.1 to Win10
https://support.microsoft.com/en-us/kb/3044374
KB3050267 - Windows Update Client for Windows 8.1: June 2015
https://support.microsoft.com/en-us/kb/3050267
KB3065988 - Windows Update Client for Windows 8.1: July 2015
https://support.microsoft.com/en-us/kb/3065988
KB3075853 - Windows Update Client for Windows 8.1: August 2015
https://support.microsoft.com/en-us/kb/3075853
KB3083325 - Windows Update Client for Windows 8.1: September 2015
https://support.microsoft.com/en-us/kb/3083325
KB3083711 - Windows Update Client for Windows 8.1: October 2015
https://support.microsoft.com/en-us/kb/3083711
KB3102812 - Windows Update Client for Windows 8.1 - High CPU/Long Scan Fix
https://support.microsoft.com/en-us/kb/3102812
(Recommend installing KB3102812 if you have installed the previous Windows Update Client Updates)
KB3112336 - Windows Update Client for Windows 8.1: December 2015
https://support.microsoft.com/en-us/kb/3112336
KB3135449 - Windows Update Client for Windows 8.1: February 2016
https://support.microsoft.com/en-us/kb/3135449
KB3138615 - Windows Update Client for Windows 8.1: March 2016
https://support.microsoft.com/en-us/kb/3138615
KB3161606 - June 2016 Update Rollup for Windows 8.1 (Includes Windows Update Client for Windows 8.1: June 2016)
https://support.microsoft.com/en-us/kb/3161606