Most of the achievements for this game are pretty simple and straight forward.

NUMANUIN
NUMANUIN: Got upon opening.

Play
Press Play: Pretty simple press play.

Kill Slime
Kill your first Slime: Shot a Slime.

Kill Golem
Kill your first Golem: Shot a Golem.

My first time
Your first death: Die.

Pick Speed
Pick up the speed-booster: Pick up the blue boots.

The capitalist
Earn the first Coin: Pick up a coin.

Pick Bag
Pick up the money bag: Pick up the bag of coins.

Pick Gun
Pick up the gun-reloader.

First aid kit
Pick up the aid-kit: Pick up a heart.

Pick Exploders
Pick up the exploder.

100 Enemies
Kill 100 enemies in total in one attempt.

Kill Piranha
Kill your first Piranha: Should be the new enemy on wave two.

100 Golems
Kill 100 Golems in one attempt.

Stats
View your results in the menu.

100 Slimes
Kill 100 Slimes in one attempt.

Kill Snail
Kill your first Snail: New enemy on wave 3.

Kill Eyeball
Kill your first Eyeball: New enemy on wave 4.

256
Kill 256 Slimes in all time.

The Best
Get on the list of top 10 players!: The list is based on time alive, survive!

Kill Orc
Kill your first Orc: New enemy on wave 5.

80 Piranhas
Kill 80 Piranhas in one attempt.

Gun
Upgrade gun-reloader for the first time: This requires coins play the game get coins and when you die go to power-ups in the menu.

70 Snails
Kill 70 Snails in one attempt.

9 lives
Pick up 9 aid-kits in one game: Pick up 9 hearts in one game.

Speed
Upgrade speed-booster for the first time: Same as the gun-reloader need coins and is in the power-up menu.

60 Eyeballs
Kill 60 Eyeballs in one attempt.

13th
Die 13 times in one game: Requires 10 hearts unless youve upgraded the heart in the power-up menu.

Your first hundred
Have 100 coins in your inventory.

Explosion
Upgrade exploders for the first time: Requires coins same as the others.

1000 Enemies
Kill 1000 enemies in total in one attempt: Good luck nothing more i can say.

50 Orcs
Kill 50 Orcs in one attempt.

There are children here!
Disable blood in the settings: Go to settings, than other and disable blood.

128
Kill 128 Orcs in all time: Over all games, doesn't have to be in one.

512
Kill 512 Golems in all time: Over all games, doesn't have to be in one.

Max Gun
Upgrade gun-reloader to the maximum level.

333
Kill 333 Snails in all time: Over all games, doesn't have to be in one.

228
Kill 228 Eyeballs in all time: Over all games, doesn't have to be in one.

Minimalism
Clean the HUD from excess: Go to settings, than other and then turn HUD to minimum.

Numa Numa Cat
🌚🌚🌚 666 😻😻😻 666 🌚🌚🌚: When you reach 666 points in the game, look carefully at the top of the screen, there will be an easter egg. You need to shoot and hit it. Then you will get the achievement!

Max Explosion
Upgrade exploders to the maximum level.

At speed
Collect 25 speed-boosters in one game.

Max Speed
Upgrade speed-booster to the maximum level.

Rapid-fire
Collect 25 gun-reloaders in one game.

666
Kill 666 Piranhas in all time: Over all game.

Lives
Upgrade aid-kit for the first time.

Blow up the dance floor
Collect 30 exploders in one game.

5000 Enemies
Kill 5000 any enemies in all time: Takes some time but pretty easy, just kill things.

Max Lives
Upgrade aid-kit to the maximum level.

Time
Play the game for 130 minutes: PLAY THE GAME.

Rich man
Have 500 coins in your inventory: Just save you money not over all games.

Just Die
Die 300 times in all time: Easiest once you fully upgrade the heart.

1000 coins
Accumulate 1.000 coins for all time.