To quote the actual wiki on achievements page, "The first achievement requires 25 generators.
The second achievement requires 50 generators. Look for an addition to the tree that will result in a 50% increase in production.
The third achievement requires 100 generators. Look for an addition to the tree that will result in a 100% increase in production.
The fourth achievement requires 150 generators.
The fifth achievement requires 250 generators."
Well it's good that it's fine, may just be a random bug, let's hope that the devs will fix it and add the new stuff.
Did you buy the Singularity?
It resets your game at the cost of you get some megabits