No missable achievements (plus 29 unknown)
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Very good question...
First use of a switch. An achievement that only has nostalgia value.
Use the Protopulse for the first time
First time the Protopulse is attracted by a Tesla
Collect all the statues in an act
Play and finish an act on your own
Play and finish an act with a friend
Save Vince-var-A from his cell
Restart a room
Follow Vince-var-A until Nylus shows up
Be gently mocked by the achievements system
Kill a friend by farting
Finish the adventure
Take control of a Vbot
Kill one of those big fat Vbots. They deserve it.
Rach Vince-var-A's jungle lab
Play and finish an act with two friends
Bark loudly to wake up any sleeping Vbots
Get all of the parts for Vince-var-A's machine
Finish the adventure. For real.
We can't find an excuse to give you three medals!
Win your first challenge
Finish an insane number of rooms
Collect all the statues
Win all the challenges
Finish an act, collect all the statues, and complete all its challenges
Defeat Nylus without giving him enough time to charge a single Protopulse
Collect all the statues, complete all the challenges, and finish all the acts on your own, with one friend, and with two friends