Here is the full list of all 13 Sokobond Express achievements.
Connect with an atom indirectly
Predict a collision
Make your first molecule
Give an electron to an atom
Keep all molecules inside the playarea
Travel the same tile twice
Trigger more than 1 bond on a single step
Complete a level with a loop path
Have an atom skip bonding
Bend a covalent bond
Complete a level with 2 molecules
Complete Omega-99
Complete all of the levels