Age of Empires II: Definitive Edition (PC) - Achievement - Alexandra the Great
Complete all side-quests in "The Queen in the Panther's Skin".
This achievement triggers upon completion of all side quests during the first phase of the mission. Time is crucial as all side-quests must be completed by the time the timer reaches zero.
The level is roughly divided in half by a vertical river down the centre of the map. During the initial phase, you will only be able to access the left side of the map.
From your starting location, head East and destroy the supply depot. You'll want to stick to the East side of the map and follow the edge up North. You'll reach the Turkomans (Blue) and will need to destroy their Town Centre.
As you move your forces round the map, remember to research upgrades. Cavalry units are best as they will traverse the map the quickest.
Once you destroy the Town Centre, start following the West edge of the map and loop back around on yourself and make your way to the far West of the map. Be sure to explore everywhere to discover the locations of all secondary objectives. Some of the supply depots are hidden away somewhat. The map is not particularly large, so exploration is not difficult.
Once you reach the far West, head south to the Ghorid fortress. This is the only part involving enemy Castles, so it would be wise to have some Trebuchets prepared. Other than this section, everywhere else can be cleared without siege units. Even this part does not require siege units, but losses may be heavier otherwise. Just remember to keep pumping troops when you get resources and get all cavalry-related upgrades.