Here is the full list of all 47 NieR:Automata achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
1 hour played with 9S in a certain state.
All endings achieved.
2B's secret discovered 10 times.
50 machine lifeforms destroyed with berserk mode.
50 machine lifeforms destroyed by remote control.
All Pods upgraded to the highest level.
All Pod programs obtained.
All weapons upgraded to the highest level.
80% of all archives found.
Emil destroyed.
10 friendly machine lifeforms destroyed.
The place of memories has been visited.
Achieve 9S's ending.
View the final credits.
Achieve A2's ending.
Watch the final moments of Devola and Popola.
Stop all resource recovery units.
80% of all unit data unlocked.
Grant Pascal's final request.
80% of all quests completed.
Control A2 for the first time.
Watch 2B die.
Achieve ending B.
Any weapon upgraded to the highest level.
100 machine lifeforms destroyed by hacking.
Any animal ridden for 5 kilometers.
All Pods found.
20 different kinds of fish caught.
80% of all plug-in chips collected.
Play your first hacking game.
Achieve ending A.
Complete the abandoned factory.
Complete the copied city.
Materials gathered at a hidden harvest point 10 times.
Emil's shop used for the first time.
Complete the flooded city.
255 enemies destroyed using a flight unit.
At least 100,000 G in possession.
Complete the forest castle.
Have 100 bodies collected.
Complete the alien ship.
Complete the amusement park ruins.
Have your body collected.
Complete the desert area.
Complete your first quest.
Arrive at the city ruins.
Stare into space from the Bunker.