Kingdom Rush Frontiers

There are 8 different tower types to build. (upgrades aren't necessary for achievement)
>>Divide and conquer - Achievement Video Guide<<
Level: 12 The Underpass (Heroic Challenge) because you start with 3000 gold, there is only one exit and all upgrades are available.
Hero: Any.
Upgrades: Reinforcements (max), Rain of Fire (max).
1. Build Battle-Mecha T200 with Wasp Misiles II upgrade in the upper right center of the map and rally it to the left. (1590 gold with upgrades)
2. Build Assassins' Guild on the top left side of the map and rally them as low as possible on the path. (570 gold)
3. Build Knights Templar in the bottom center of the map and rally them as high as possible on the path. (570 gold)
Add additional defenses as the level progress:
4. Build Crossbow Fort on the bottom left side of the map. (540 gold)
5. Build Necromancer Tower in the upper left center of the map. (800 gold)
6. Build Dwaarp in the center of the map. (1065 gold)
7. Build Tribal Axethrowers in the left center of the map. (540 gold)
8. Build Archmage Tower anywhere. (800 gold)
Don't call the first 2 waves early.
Use Rain of Fire on Nightscales (invisible) on wave 2 when they are close to the Battle-Mecha T200.
Use Reinforcements to kill the flying enemies on waves 2 and 3.
Shouldn't last longer than 4 waves.

This achievement is obtainable from level 10 (Ma'qwa Urqu) onwards, once you have unlocked the eight specialist tower types

As the achievement suggests, you need to build one of each of the level 4 towers:

Archer Tower

• Tribal Axethrowers
• Crossbow Fort

Mage Tower

• Necromancer Tower
• Archmage Tower

Miltia Barracks

• Assassin's Guild
• Knights Templar

Dwarven Bombard

• Dwaarp
• Battle-Mecha T200

This achievement is best attempted on the later levels, as you usually end up with more money than you can spend towards the final waves, and will unlock as soon as you have built the final tower