Here is the full list of all 25 Weyrwood achievements.
Win at the Games.
Finish the game with at least 70% Intelligence.
Finish the game with at least 50% Philanthropy.
Finish the game with at least 70% Dangerous.
Finish the game with at least 70% Influence.
Win a chariot race.
Take a lover.
Marry.
Elope.
Lead the Night Watch.
Trade away memories in a Weyr bargain.
Lose all your spina and become a daemon thrall.
Become Lost by wandering the Wilds.
Fight in a duel.
Make a mortal enemy.
Gain the Weyrs as allies.
Burn down the Wood and eliminate the Weyrs.
Receive and use the Weyrs' gift.
Make a bargain with the Weyrs for more spina.
Successfully complete the terms of a Weyr bargain.
Save Prosper from destruction.
Discover the identity of the spy.
Become Expelled from Prosper.
Ally with the daemons.
Turn against Prosper.