Here is the full list of all 31 Slime Rancher trophies - there are 14 bronze, 10 silver, 6 gold and 1 platinum.
Platinum
Reach at least 75,000 newbucks in Rush Mode
Score 50 points in a single game of slimeball
Complete Adventure Mode and set out for what's next.
Fabricate 35 Slime Science gadgets
Return to the Ranch after more than 24 hours
Place a tarr on the #1 Slime Stage
Incinerate an elder chicken
Start bringing life back to the Glass Desert
Send an adorable chick to a fiery end, the same place you're now destined to go
Have at least 10 types of largos on the Ranch
Have at least 3 different types of largos in the same corral
Fulfill a Range Exchange request between Noon and 2 PM
Have 3 different fruit trees on the Ranch at the same time
Stand inside a rad aura for at least 15 seconds
Constrain more than 15 slimes in your vac stream at once while on the range
Use chroma packs to change the color of the ranch house, tech, and vacpack
Shoot a boom slime largo into the air that explodes before landing
Fabricate your first Slime Science gadget
Have 3 different veggie gardens on the Ranch at the same time
Earn over 25,000 newbucks
Earn 5,000 newbucks in a single day
Burst a gordo slime
Obtain at least 3 gold plorts from a single gold slime
Join the 7Zee Rewards Club
Feed 100 chickens to slimes on the Ranch
Sell 500 plorts at the Plort Market
Stay awake from 6 AM to 6 AM the next day
Let a tabby slime headbutt you right on the nose
Jump into a corral containing at least 40 slimes
Shoot food into an airborne slime's mouth