Time for another round of these, methinks..
Bergentrückung: Starting as Aachen or Thuringia, own the entire French region, the whole Low Countries region, Lübeck, Zagreb, Prague, Moravia, Magdeburg, Spoleto, Navarra, and Barcelona. Westphalia, Hannover, Germany, France, and the Holy Roman Empire can be formed for this achievement if desired. (In effect, restore the Carolingian Empire at its furthest extent.) (Very Hard)
Isla de Muerta: Cause an enemy to suffer at least 20,000 losses to attrition sieging an island fort. (Hard)
The New Old Republic: Start as a Merchant Republic, become a Monarchy, and become a Republic again without forming another nation. (Easy)
Front and Center: Spawn three institutions while being the first Great Power. (Very Easy)
Forges of the White Hand: As a released Saruhan, spawn Manufactories in Saruhan province. (Very Hard)
The Gilded Cage: As the Timurids, have the Ottomans as a vassal. Do not form the Mughals. (Medium)
We Are Destroyer: As any (non-custom)Horde, raze Vienna, Paris, Constantinople, Berlin, Cairo, Madrid, and London. (Very Hard)
Intensify the Forward Firepower!: Have a full +8 siege bonus on a level 8 fort. (Easy)
Envy of Poseidon: Confirm a Thalassocracy. (Hard)