Here is the full list of all 31 HammerHelm achievements.
Place 10 houses
Place a brewery and assign a brewer
Place a fishing pier and assign a fisherman
Have a carpenter and 3 fully furnished homes
Craft a full set of copper armor
Destroy 4 monster camps
Place a farm and assign a farmer
Place a water well
Spend 5 skill points
Have a Stomemason craft a fireplace
Meet Grrrumble and learn his story
Destroy monsters in a dungeon
Meet Shaydee the Goblin
Craft a shield
Clear monsters from a cave
Craft a healing potion
Craft any weapon
Chop down a tree
Mine three ore rocks
Place a house
Place a stone entrance
Place 4 stone towers
Place a weaponsmith and an armorsmith
Craft a full set of iron armor
Craft a full set of jade armor
Craft a full set of gold armor
Craft a full set of diamond armor
Craft a full set of blood stone armor
Imbue a weapon using a gem
Destroy a necromancer
Place a sewer entrance