Well done. Did you manage to get on the platform that says 'StarTreking'? It's not enough just to see it. You need to then pick up the Health icon, and boom, the big Trophy should pop out.
As for level 2 reversal direction, you can not (but nice try
). I disabled the grenade jumping for that screen to stop people taking a short cut to kill the UFO.
You do get a lot more % for finishing levels without dying. The harder the achievement, the more % you get.
Happy you still playing.