It's probably because you play in peaceful mode, this disables achievements.

You actually need to get killed by a train to get the achievement 'Watch your step'

Then they should change the description of the tech. It explicitly says it applies to logistic AND CONSTRUCTION bots!

Please forgive me if this is already discussed before. I searched but couldn't find the answer. I'm not sure if I'm doing something wrong, but my construction bots never take more than 1 item with them, even though I've researched Worker Robot Cargo Size 3, which should give a +3 bonus. What am I mi...