I would like to see them get a little more creative with the achievements, for the most part they follow the structure of, start mode X, Complete Mode X, Complete Mode X in some special way. The others are, do this thing y 10 times, 50 times, 100 times or something similiar.
Some are really silly, like start the Mode A, which is the first mode in the game and seems like silly achievement. Using Jurassic Park, starting Gallimimus achievement is dumb, its the first dinosaur, I can see Starting Raptor Paddock as more of an achievement as you need to progress a good bit to get there.
They need to branch out, I did hear on Elvira there is some achievement for completing a specific mode on Friday the 13th, that's cool.
Would love for them to add "bad things as well". Have 5 staff members eaten in Jurassic park.
Streaks would be cool too, Start MechaGodzilla MB 5 games in a row.
They should also unlock things on your insider account, example, all the avatar icons are generic, complete 50% of Godzilla Achievements unlocks Godzilla avatar, 75% unlock Megalon avatar for your account etc.... Complete 100 achievements unlock special background
Once they actually make an app they could do push notifications - "Its been 5 days since you played Godzilla, Tokyo is in trouble!"