Originally Posted by X Razes all X
For "This Side Up" achievement, can you revert to last save if you flip over or do you have to start the mission over again?
The last checkpoint will be when you're coming up the lift. So you can die or revert and start a fresh run everytime (thank god!)
Also, if you're in co-op, as long as both players get in a separate warthog, the better player can speedrun it with P2 hanging back in a hog. P2 will get the speedrun achievement + the not tipping over achievement.
So find a friend who can do this with ease and basically sit back if you're having trouble getting either achievements.