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