Well, almost all tiles; the few that remain after running the script below (save as unpin.ps1 then right click and "Run with PowerShell") can be removed manually (right click tile > "Unpin from Start").
UPDATE: A smaller and more efficacious PowerShell script by max630:
(New-Object -Com Shell.Application).
NameSpace('shell:::{4234d49b-0245-4df3-b780-3893943456e1}').
Items() |
%{ $_.Verbs() } |
?{$_.Name -match 'Un.*pin from Start'} |
%{$_.DoIt()}
/windows | Feb 04, 2017