3 Bagger trophy Kill three worms with one shot (one turn).
4 Bagger trophy Kill four worms with one shot (Holy Hand Grenade is probably best).
Animal Lover trophy Get at least 200 total kills with animal weapons (for example, sheep).
Barrel Buster trophy Blow up at least 500 green explosive barrels (overall throughout the game).
Big Blast trophy Get 500 damage in one shot (getting two worms with 250 HP each in the water with a shotgun is probably easiest).
Body Count trophy Get at least 500 kills (total throughout whole game; includes multi-player matches).
Bronze Damage trophy Get at least 25 000 total damage (overall throughout the game).
Gold Damage trophy Get at least 100 000 total damage (overall throughout the game).
Greedy Worm trophy Collect at least 500 total crates (overall throughout the game).
Hot Foot trophy Successfully dodge at least 500 mines (overall throughout the game).
Magic Bullet trophy Kill three worms with one shot (shotgun recommended).
Rocketeer trophy Use at least 2 000 total jet pack fuel (overall throughout the game).
Silver Damage trophy Get at least 50 000 total damage (overall throughout the game).
The Beast Within trophy Get three kills with one animal weapon (sheep recommended).
Weapon Specialist trophy Get at least 8 000 total damage with the bazooka (overall throughout the game).

Weapons (150 coins)  -  In the list of schemes in the shop, most cost 50 coins but four of them cost 150. If you buy one that costs 150 coins, you will unlock the weapon that corresponds to that scheme in the shop:

Unlockables

The Bubble Trouble Buy the "Darksider" scheme
The Holy Hand Grenade Buy the "Holy Grail" scheme
The Icarus Potion Buy the "Mega Powers" scheme
The Inflatable Scouser Buy the "It's a Mystery" scheme

Unlockables  -  Hold Until Reworked and Re-Submission maps Defeat Team17 times in the deathmatches they are used on.
Mission and Tutorial maps Successfully complete the mission/level that uses them.

Special Head Gear (150 coins)
Note: Time bonuses are not required.

Unlockables
Boggy The Kid Successfully complete Wild West part of the story (missions 11 to 15).
Caveworm Successfully complete the Prehistoric part of the story (missions 21 to 25).
Hard Hat Successfully complete the Construction part of the story (missions 1 to 5).
Queen Of Sheeba Successfully complete the Arabia part of the story (missions 16 to 20).
Royal Knight Successfully complete the Camelot part of the story (missions 6 to 10).

Trophies  -  Getting trophies for the trophy cabinet will give you 100 to 500 coins to spend in the item shop. To get the trophies, you must accomplish a certain task or get a certain number of damage points, etc.