Step 1: Clear the 14 Trophy Challenges
When you start up the game, one of the options in the main menu is called Trophy Challenge. Select that and you will see a list of 14 challenges, and a status icon next to each challenge. The status icon starts as transparent, and as you complete each challenge and earn the trophy, those icons will color in (showing the trophy weight). An E inside the trophy indicates that Encore DLC is required for the challenge/trophy.
Here is a list of the challenges:
Green Flag clear the specified stage without a tower ever upgrading
Scrooge clear the specified stage with a balance of 10000 or more coins
Bomb the Boss: clear the specified stage using only bombs to destroy the boss.
Gem Hoarder clear the specified stage with 25 or more gems
Picky Eater clear the specified stage without using the fire tower
No Crossing clear the specified stage without crossing the bridge
Tower Collector clear the specified stage building all types of towers
Get Medieval clear the specified stage using only arrows and cannons
4 Tree Rainbow perfect clear the specified stage
Rainbow Team perfect clear the specified stage
DLC Zero Carat clear the specified stage without using gems
DLC Wishing Well Drop 100 coins into the water and clear the specified stage
DLC Scrooge's Return clear the specified stage with a balance of 12000 or more coins
DLC Black Flag without selling any towers, clear the specified stage with all towers upgraded to black
While playing a challenge, you will see an icon in the bottom right corner of the screen, indicating as follows:
A Solid Trophy: keep playing, making sure you follow the requirements!
An X on top of the trophy you failed the requirements of the challenge , hit and click Retry.
A checked trophy you met the requirements of the challenge, now finish the stage to get the trophy!
Step 2: Cleanup
While doing the trophy challenges for Step 1, you might by chance get some of the following trophies. For any you don't get by chance, complete each of these listed below to finish off your 100%! These are all rather simple to get, even more so when in comparison to the 14 challenges.
Play Tiki Island - Easy 3. Monsters don't drop any coins on this stage, so simply run through every single tree to get the coins, and by getting all the coins in a stage you will unlock Money Grubber.
(credit to MoviStar311)
Play Tiki Island - Easy 3 again and using the 2000 gold you started with, run from tree to tree building towers straight away. After building 10 towers in less than 30 seconds upon starting the stage, you will get the Construction Expert trophy.
Play Trophy Challenges for Scrooge's Return or Black Flag, saving up 5 gems over the first few waves. On wave four (spiders), press to plant a bomb somewhere on their path, and when the spiders are walking over it, hit again to detonate the bomb. As you will easily kill six enemies using one bomb, you will obtain Wave Goodbye. Note that if you play Toki Island Easy 1, which is actually the same stage, you will need to have first unlocked the bomb skill by completing the last medium stage. If you play on the trophy challenge levels, bombs are available straight away.
Play Tiki Island - Hard 1. Play as usual, after wave 4 (dwarfs) destroy all your canons, after wave 5 (fleas) destroy all your air-defense guns, after wave 7 (spiders) destroy your arrows. Use 15 gems to buy the mortar tower from the village, and then build the mortar on the right side as shown in frollard's video; upgrading to the black flag ASAP. If done properly, on wave 8 you will kill 15+ enemies with one mortar to unlock Deep Impact. Note: Some people also get this by luck while doing the Tower Collector trophy challenge.
Start up a game on Tiki Island - Medium 4, and run through all 4 trees to see if you get 15 coins and a gem. If you didn't, hit and click Retry till it happens (you have a 1 in 16 chance), and when you get the stash you also get the Encore: Lucky Find trophy. Note that while you can play this level without the Encore DLC, the trophy will only unlock if the DLC is installed.
Thanks to frollard for the solid trophy guide and videos, and the trophy-specific contributers (noted in the road map above).
Road Map is complete! Open to suggestions, feedback, comments, etc. Thank you for reading and I hope you have fun getting your 100%
[PST Would Like to Thank TigerLust for this Roadmap]
No word of a lie - this challenge is one of the biggest pains in the you-know-where ever. It took better than 30+ tries to get it perfect. The first 5-10 waves are the deciding rounds. If you survive that long with *this* strategy, you're golden. Watch out for 18 and 19.
Clear the specified stage without a tower ever upgrading
This one again, quite simple - you don't need to rainbow the level, just survive... Yay if you do! First thing, I suggest holding L1 so you have a good idea of how many kills each has. Next, Overbuild. Build MORE than you need such that each tower never gets too many kills. Clump your towers close so they're quick to run to. Between rounds, sell any tower and rebuild if its more than 50% upgraded. Lather, rinse, repeat.
No video; just...pay attention! Helps to use 2 players, and play on an easier level (shorter = better). Make sure to go thru ALL the trees for the random drops, those count. Avoid selling towers, and especially avoid levels that have water. You don't have to rainbow, so keep it simple!
I don't really need a video to explain this, just use the 4-tree level. Upon starting, head for the trees. The logic is there are 3 coin drops and 1 gem drop (4 total) which all have to be released from THE SAME tree. If you get ANY drop which is not 15 coins and a gem, retry the level. Takes 10 to 50 tries. The odds of getting it on ANY tree is 1/4^3, but you get 4 tries per load, so 1/(64/4) = ~1/16.