Eight Gates: Siege, Demolition and Assassination

Actually 4 (active) Summon Gates, and you have to destroy them all to spawn a Boss. You can guess what you have to do after that.
Saving A Dou: Deploy and Destroy

Nothing much to say about this mission except that it's easier than Battle of Changban. It's a regular straightforward mission with 'go there and kill stuff' objectives.
Battle of Changban: NPC Showdown

This introduces the timed-event missions where you are supposed to wait for certain times to accomplish objectives. There's nothing you can do to speed things up, you will have to wait.
Act of War: Average Gears Style

Running this mission with average gears can be hard, but it's easier if you have a mass DEF debuffer like Cannon Main here. Debuff, kill, move forward, repeat your way to victory.
Sumpah Palapa: Point and Click

This mission is so easy it doesn't even need a guide. Any level 95 can do this with minimal gear, easy 5m+ EXP for a few minutes of easy clicking.
Warrior's Honor: Boats and Shortcuts
Cannon Main + Witch + Shaman.
This mission introduces Boats, something you might not enjoy having to ride on in this game. Also there's a shortcut trick here so you wouldn't have to kill as many mobs as you would if you follow the preset objective sequence.
Fortress Assault: Guerrilla Warfare

Destruction of enemy supply routes while eliminating the enemy force one group at a time is what's demanded to be able to solo this mission. And as usual for low level TBSs, a Witch is required if you have low gears like the stuff used here.
Forbidden Land: Flame Trap Method
Spear Main + Valkyrie + Taoist.
Burning snakes for fun. This is probably the easiest way to kill the boss here even with low gears. Ever seen 813K+ damage?
Call to Arms: Selective Killing

This one is much easier than the first Majapahit TBS. It's basically free giant EXP at level 85, plus you get to have fun killing harmless mobs at the end.
Act of War: Music Main

This is one of the easier and faster Dogon missions. Was a lot easier before the Three Gateways patch but still very doable with average gear (+4 evil weapons type average). No bosses to kill. Kill all mobs as you move north and destroy 4 buildings (prisons) to complete the mission.