Gravity Crash

There are hundreds of gems scattered across the 35 planets, in colors of green, orange, blue and purple. You will need to find all of them for this trophy. If you miss any during the Campaign, you can get them in Planet Mode later on, but you should do them all if you can during Campaign. There are no continues in Planet Mode, so in that mode you have to get them all and finish the level in a single game - which can be quite tough for some of the later planets.

See the FAQ linked in the Road Map for the gem quantities of each planet. The locations of the gems are not listed, since the vast majority of them are out in the open and easily found if you explore each level to completion. However, there are a few levels where gems are hidden inside breakable walls or in areas that you cannot backtrack to, which means you might have to redo them in Planet Mode. These are the planets you need to take special note of:

Bonoso (3.6) – Gems hidden in walls
Magmassen (4.3) – Cannot backtrack whenever you allow the lava to rise
Gravhaagen (4.4) – Gems hidden in walls
Shoyukai (5.1) - Need to do some backtracking to get all green gems
Kurozu (5.2) - Gems hidden in walls
Teleki (5.4) - Need reflective shot to destroy shields that guard gems
Orima (5.5) - Gems hidden in walls