Here is the full list of all 11 Take Thy Throne achievements.
Kill 50 Dragons
Kill 100 Players
Slay 10 Kings at your own hand
Win 15 games of Take Thy Throne
Take down 20 Towers
Capture 20 flags in CTF
Mine 80 Ores
Chop 80 Trees
Kill 100 Golems
Buy 70 Items from the store
Play during Halloween