-Estimated achievement difficulty: 3/10
-Offline: 12 
-Estimated time for 200: 4 hours
-Minimum playthroughs: 1
-Missable achievements: None!
-Glitched achievements: None!
-Cheats disable achievements: No Cheats
Assault Heroes is a car-based 3D shooter. As you progress through the various Zones, you pick up power-ups, lives, and upgrades to assist up against the hordes on enemies standing between you and the end of the Zone. Most of the achievements require you to finish a Zone in certain ways, with one achievement for finishing the entire game.
Step 1: First Playthrough
This is the playthrough you are going to unlock "Layer Slayer" on. You only have one chance at every lair. Die once, you have to start all over. On Zone 1, you will have to use a trick where you fire your machine gun at the barrier defending the people throwing the explosives at you. Every hit on this barrier raises your accuracy, and it never dies. Sit there for about half an hour shooting this barrier, and be careful with your shots for the rest of the Zone. This will net you Sharp Shooter. As long as you didn't die, you should also have unlocked "Unstoppable".
Once you reach the second Zone, you are going to try and kill 85%+ of the enemies. Enter the lair as before. Kill the boss, and you should unlock "Annihilator". Now just finish Zone 3, and Zone 4, entering the lair of both Zones. When you are done with Zone 4, Lair Slayer should unlock. Complete the game to unlock "Assault Hero".
Step 2: Zone 1 Mayhem
Now that your first playthrough is complete and you have unlocked "Lair Slayer" (harder than I make it sound,) the rest of the achievements can be unlocked on Zone 1. First off, get a buddy to play with you, or go on Xbox LIVE and play Zone 1 in two player mode. When the Zone is complete, "Twin Medal" will unlock.
Re-enter Zone 1, start on area 4, and try to avoid killing anyone. Be careful all the way to the final boss to avoid everything. Once you reach the boss, nuke him, grenade him, do whatever you can to kill him as fast as possible. If done correctly, this should net you Peace Maker.
Start Zone 1 from the beginning. As soon as it starts, hop out of your vehicle. Continue on foot, killing everything you can along the way. Be sure to enter the lair for a few extra kills on foot. Only enter your car to take down the 2 bosses. If you killed more than 60% of the Zone's enemies on foot, you will unlock Survivor.
If you haven't unlocked "Tricked Out" naturally, now is the time to play through the game without doing anything but focusing on weapon upgrades. "Small Arms Expert" can be easily unlocked on Zone 1 by staying in your vehicle, being sure to never fire a nuke or a grenade. If you haven't unlocked "Speed Freak" yet, try to finish Zone 1 as fast as you can, hugging the top of the screen to make it go faster. If "Lair Slayer" has been giving you too much trouble, try it again playing co-op with a friend.
[XBA would like to thank Blue Radium for this Roadmap]