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