The All Variants category requires you to beat an AI (trainer, regular, aggressive or balanced) in every single variant. These are all the variants that are required:

• Simple - No Rooks • Simple - No Knights • Simple - No Bishops • Simple - No Queens • Simple - Knights vs. Bishops • Simple - Simple Set • Small • Small - Flipped • Small - Centered • Small - Open • Very Small • Very Small - Open • Misc - Timeline Formations • Misc - Timeline Tactician • Misc - Timeline Strategos • Misc - Timeline Battleground • Misc - Timeline Skirmish • Misc - Timeline Fragments • Misc - Timeline Marauders • Misc - King of Kings • Misc - Excessive • Misc - Royal Queen Showdown • Standard - Half Reflected • Standard - Defended Pawn • Standard - Princess • Standard - Turn Zero • Standard - Two Timelines • Standard - Reversed Royalty • Focused - Just Rooks • Focused - Just Knights • Focused - Just Bishops • Focused - Just Queens • Focused - Just Kings • Focused - Just Pawns • Focused - Just Unicorns • Focused - Just Dragons • Focused - Just Brawns

The Just Kings variant is not required for the Balanced difficulty, however is in every other difficulty. The time starts the frame the first game has started. Your first successful attempt is the game that starts the timer.