Please give it a Thumb up if it helped you :)

So, gettin this Achievement is simple with the right Tactic.

I did it in the last level, get all Asteroids around one of the big Asteroids and Autosend the produced Seeds to it. (I took only the weak to attack the big one) Picture below shows it pretty well:











While you auto attack the big one, concentrate on defense of your frontline towards the other Big ´roid.

Fast forward, and voila - Stalemate :)

Please give it a Thumb up if it helped you :)

Here are the locations:

You don't need to finish a level if you go back for an artifact. You can get the artifact and quit - you dont have to finish the level.
Levels can contain up to two artifacts, here's a list of all 30 artifacts and in which level they appear:

•Level 04: Ovoid 7
•Level 05: Cubos, Q-Plane
•Level 06: Bolian Radio
•Level 07: Celestia Nest
•Level 08: Amberous, Gersical Void
•Level 09: Antropian Trap
•Level 10: Micro Nautilus, Gliesian Mirror
•Level 11: Geres Cloud Horn, Grower Husk
•Level 12: Cache 13
•Level 13: Cache 14
•Level 14: Auto Vac, Iron Baloon (Not only Dark Matter Mode, only if you dont get it in normal)
•Level 15: Flux Calendar
•Level 16: Fear Flower
•Level 17: The Twins
•Level 18: Guardian
•Level 19: The Versuvia Tablet, False Witness
•Level 20: Companions
•Level 21: The individual (Dark Matter Mode)
•Level 22: Zotropic Enhancer, Gravitonastus
•Level 23: Sensoric Antenna(Dark Matter Mode), Protoflora
•Level 24: Mimic
•Level 25: ? (Dark Matter Mode)

Found this on Playstationtrophies, Topic from dcdfan.

Hope this helps you Guys :)

Thanks for Hints to: LMK - politicalmind and xsni