Here is the full list of all 43 Archon Classic achievements.
Fight the Shapeshifter using the Phoenix and win. Probably the longest battle in the world. This cannot be unlocked in the campaign.
Kill the Dragon using a Knight on any color square using only your primary attack (sword) and never using your shield...you're extra cool if you do it on dark, though. This cannot be unlocked in the campaign.
Use ONLY your Knights/Goblins to win a game! This cannot be unlocked in the campaign.
Win a combat by only firing once. This cannot be unlocked in the campaign.
Win a game without losing any pieces...either by Power Squares or Annihilation, doesn't matter.
Win a game without losing any Knights/Goblins. This cannot be unlocked in the campaign.
Don't use ANY spells the entire game. No, not even one! This cannot be unlocked in the campaign.
Get the squares and win the game against CUNNING AI, any difficulty.
Kill 'em all. No Mercy! Must be against Hostile AI, any difficulty.
Kill all opposing Knights/Goblins against the AI on Insane difficulty...yeah, every last one!
This is for the fast mover! Win a game in under 3 minutes (if playing against CPU, must be on skilled difficulty or higher.) This cannot be unlocked in the campaign.
Simply win a game against the AI on Insane difficulty in under 2 minutes. Simple, huh?!
Win 3 Combats with your Banshee in a single game. This cannot be unlocked in the campaign.
In Alastar's Regret—Quest 11, don't use any magic at all. Just your skills
In Prelude to Dusk—Quest 13, only get 2 kills to solve the board.
In Last Midnight—Quest 9, kill everyone...yup all 57 opponents!
Earn 1 million points playing the Alastar's Regret Campaign.
Earn 1 million points playing the Prelude to Dusk Campaign.
Earn 1 million points playing the Tempest's Revenge Campaign.
Earn 1 million points playing the Last Midnight Campaign.
Complete Alastar's Regret on Normal AI setting.
Complete Prelude to Dusk on Normal AI setting
Complete Tempest's Rage on Normal AI setting
Complete Last Midnight on Normal AI setting
Complete Alastar's Regret on Insane (L4) AI setting.
Complete Prelude to Dusk on Insane (L4) AI setting.
Complete Tempest's Rage on Insane (L4) AI setting.
Complete Last Midnight on Insane difficulty.
Earn 5 Gold medals during any campaign in Conquest.
Earn 10 Gold medals during any campaign in Conquest.
Earn 15 Gold medals during any campaign in Conquest.
Earn 30 Gold medals during any campaign in Conquest.
Earn 45 Gold medals during any campaign in Conquest.
Earn 60 Gold medals during any campaign in Conquest.
Earn 90 Gold medals during any campaign in Conquest.
Earn 120 Gold medals during any campaign in Conquest.
YOU DID IT! You Played through all 4 campaigns on both Normal and Insane AI settings. Congratulations!
Holy Cow...You got ALL GOLD MEDALS on every quest! You are the uber-Archonian! All should kneel at your feet and pay homage to you and your outstanding efforts. Very well done!
Using the Sorceress, use ONLY her secondary ability to win in Combat. Toasty! This cannot be unlocked in the campaign.
Kill two enemies with a single attack. This cannot be unlocked in the campaign.
Offer one of your pieces to the enemy team. This cannot be unlocked in the campaign.
Use the knight's shield to reflect a shot and kill an enemy. This cannot be unlocked in the campaign.
Win a game by taking all of the power squares AND killing every enemy piece. This cannot be unlocked in the campaign.