"Never do it for free." Trophy in LEGO Batman: Legacy of the Dark Knight

Collect 30,000 Studs within a single stud combo

Bronze trophyBase game

The stud combo is the meter beside your stud count, top right. Collecting studs fills it and raises the multiplier. A combo starts at 2x and ends when the multiplier drops back to 1x. Collect 30,000 studs within one combo.

If you have Gold Bricks, spend them on Hyper Combo (a higher multiplier) and Stud Magnet (studs from further away), the first two skills in the Exploration tree.
In Chapter 1's Iceberg Lounge level, once the rooms with security cameras begin, smash everything in each room and hallway without a break.

Opening stud chests in the open world can do it too. It goes together with "I'm good with calculation.".