Some achievements are very difficult to obtain and cannot be consciously completed...they just happen eventually with a certain probability. The achievements of losing against a high-chance Legion and winning against a low-chance Legion just happen over time and require some luck/bad luck.
For the "Master Strategist" achievement, which requires winning a battle against the Romans with a low chance of winning, the chance of winning must be 4% or less. To achieve this, a good recommendation is to take an Egyptian worker to 0 power, equip it with a normal spear, and then attack a 20 power patrol (in Alexandria) with that worker. After a few to many attempts with this method, you should be able to complete the success. See also: [[Tips_for_Quest_Tips for Quest "Master_StrategistMaster Strategist"]]
==Unavailable Achievements==
* Selfless Giver - Create beautifully Wrapped Gifts
* Tulip Lovers - Assemble Bouquets of Tulips
* Green Thumbed Gaul - Create Flower Bouquets
* Gauls with two green thumbs - Create Grand Bouquets
===Summer Event===
* Sunny Mind - Complete the Summer event quest
* Berry Gatherer - Gather Collect Blueberries
===Fog Events===
* A Sea of Luminous Glowing Substance Sea - Gather Luminous Collect Glowing Substance
===Winter Event===
* Gallic Gift Giver - Craft Gifts* Gallic Hero - Complete the Irresistible Quest* You have Snowy Orbs - Gather Collect Snowballs* Icicle Collection - Gather Collect Icicles
* Baked Apple Gourmet - Craft Baked Apples
* Fair Game Protector - Complete the task "Fair Game"
The Hockey-Event was a one-time event and will very probably NOT come again.<br />So if you haven't accomplished these achievements they will stay forever as "unsolvednot completed".