As long as you complete all the story and side missions in the game, you can't miss this achievement. There are a total of 16 gadgets in the game:
- Omniwrench 8000 - N/A
- Swingshot - N/A
- Hydropack - Main Mission
- Helipack - Main Mission
- Hydrodiscplacer - Aridia
- Trespasser - Rilgar, Blackwater Market
- Gadgebot Upgrade Chip - Main Mission
- Magneboots - Main Mission
- Hoverboard - Main Mission
- Grindboots - Main Mission
- Jetpack - Gaspar, Telepathopus Fields
- Box Breaker - Gaspar, Telepathopus Fields
- O2 Mask - Pokitaru, Scenic Sewers
- Thrusterpack - Main Mission
- Map-o-Matic - Kalebo III
- Hologuise - Main Mission