Here is the full list of all 19 404Sight achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Spend over 60 seconds total with max bandwidth in level 8.
You saved the internet! For now...
Use the sprint ability 10 times.
Triggered 42 inhibitors in level 12.
Spend 15 seconds total in slow lanes in a single map.
Die 3 times due to running out of bandwidth.
Spend 24 seconds total in fast lanes in level 10.
Jump over 10 times in level 7
Destroy 5 inhibitors with your sprint ability in level 7.
Spend over 40 seconds total with more than half bandwidth in level 5.
Died from running out of bandwidth.
Turn on and off your ping 50 times.
Seriously, why?
Spend over 35 seconds total with less than half bandwidth in level 2.
You've survived the first level, more challenges await!
Died from falling off the map a total of 4 times.
Spend 40 seconds total in neutral lanes in a single level.
Used your sprint ability for the first time.
Died from falling off the map.