A.M.R.: Journey to the Savage Planet:
We came, We Saw, We Kicked Its Ass is not broken, just unlocked it with another player
Here is how:
So me and kevin04 got "We came, We Saw, We Kicked Its Ass"
The way it unlocked for each of us (not at the same time):
Player 1 host the fight and invite Player 2
Player 1 do some damage to the boss at start of the fight, near the end of the fight Player 1 use the burble sticky thing (called Binding Bile in game) and Player 2 deal the final hit that kills the boss .. this way Player 2 unlocks the achievement
After that switch roles for Player 1 to get it
Thank you, very useful guide! I'll add a link to this post in the Helpful hints section for those who have questions in the future.
That leaves two achievements that are at 0.0% and definitely broken, it would be nice if they were fixed sooner or later, and since 505 Games doesn't seem very interested in doing so, we should try to contact the developers directly.