Full list of all 30 Stronghold: Definitive Edition achievements.
The base game contains 26 achievements, and there are 2 DLC packs containing 4 achievements.
Complete Act I of the Main Campaign
Complete an Invasion on Very Hard difficulty
Kill 1,000,000 Units
Get a population of 300
Store 10,000 wood in a single game
Kill 100,000 Units
Store 1,000 food in a single game
Amass 10,000 gold in a single game
Kill 10,000 Units
Kill 100 Bears
Store 1,000 weapons in a single game
Complete the Tutorial
Complete Act II of the Main Campaign
Complete Act III of the Main Campaign
Complete Act IV of the Main Campaign
Complete the Economic Campaign
Win a Mulitplayer Game
Win a Multiplayer game against 7 opponents
Complete a Siege as Defender
Complete a Siege as Attacker
Complete an Economics mission on Very Hard difficulty
Make a map and upload it to the Steam Workshop
Complete the Castle Trail
Kill the Jester
Complete The Agent of the Crown
Complete Escape from Snake Island
Complete Swine's Bay
Complete the 'Home Fires' Economic Campaign
Complete the 'Noble Trail'
Complete Valley of the Wolf