Starcraft II LOTV: "Purity of purpose" achievement in "Essence of Eternity" mission

1/ build wall with bunkers 2/ siege tanks behinds 3/ a lot of vikings to deal with air units 4/ use only Kerrigan ability vs void trashers (remember 15 max) 5/ you can try to kill some zagara buildings and her creep to make a wall but it is hard to do and not so useful! 6/ you can steal zagara gases, but don't do it, you don't need more gas :) 7/ don't take gases or expand too fast, you need a lot of minerals at earl game 8/ move your tanks when you heard ""that a massive force is coming" 9/ i tried a lot of times to save Artanis, but he goes YOLO on ultralisks at his first wave, if you have an idea, pst a comment! 10/ one of the hardest achievements: don't worry if you load/restart a lot! (mission difficulty: hard)