Metal Hammer made the selection.
Metal Hammer published an article listing albums released in 1986 to prove that this was the greatest year for Thrash Metal. Check out the selected albums:
Dark Angel – “Darkness Descends”
Exumer – “Possessed By Fire”
Angel Dust – “Into The Dark Past”
Slayer – “Reign In Blood”
Kreator – “Pleasure To Kill”
Megadeth – “Peace Sells… But Who's Buying?”
Destruction – “Eternal Devastation”
Nuclear Assault – “Game Over”
Possessed – “Beyond The Gates”
Metallica – “Master Of Puppets”
The article also includes honorable mentions of "The Force" by Onslaught, "Doomsday For The Deceiver" by Flotsam & Jetsam, "Mayhemic Destruction" by Mortal Sin, "Morbid Visions" by Sepultura, "Torment In Fire" by Sacrifice, and "Obsessed By Cruelty" by Sodom.