Here is the full list of all 11 77th: The Game achievements.
Get first try on a RNG button
Reach all the endings
Get first try on 4 of the RNG buttons
Become built in between spikes
Get 6/9 on the RNG button
Knock down another company
Finish a full playthrough in less than 10 minutes
Kill the guard boss without taking any damage
Jump off the balcony
Walk a full lap at the line training
Finish a full playthrough with zero deaths