Save achievement hunting for Master Archives. Some of the ship boosts are very powerful so as the 1000% production boost. Also use the right units for the right situation to make thing very easy.
You would be surprised just how quickly dark templars with shadow fury, I think that's the chain jump attack, can rip a base apart if they don't run into detection.
oic so i can play even mission one with all the beefed up upgrades
thanks a good idea so i'll just finish normal or casual and then replay for achievements with all the buffs
The way Master Archives work is that it gives you access to every unit and upgrade you could have had at that point in the game. For instance if you did the Korhal missions before getting the dark protoss during the campaign you will have them in the Master archives. You can also change your units and ship upgrades before each mission.