Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Defeat Gul'Thak and its minions.
Catch a fish.
Free the sasquatch on the Icewind Pass.
Recruit max elves at The Silveroak Outpost.
Complete the campaign.
Defeat Vez'nan.
Have your soldiers survive the explosion of 300 demons.
Have your Paladins perform 100 Holy Strikes.
Sell 5 towers in a single mission.
Have at least 3 Imperial Guards survive in the Citadel.
Teleport 250 or more enemies.
Disintegrate 50 or more enemies.
Kill 10.000 enemies.
Earn 30 stars.
Build 4 Tesla towers in any stage.
Kill 300 enemies with electricity.
Build all 8 towers specializations.
Defeat J.T.
Change soldiers' rally point 200 times.
Have your Paladins heal a total of 7.000 life.
Have your soldiers regenerate a total of 50.000 life.
Train 1.00 soldiers.
Throw 500 or more axes.
Have a single barbarian kill 10 enemies.
Send 1.000 soldiers to their deaths.
Kill 100 enemies with meteor showers.
Upgrade all basic tower types to level3.
Defeat The Juggernaut
Use Rain of Fire 5 times in a single stage.
Kill 2.500 enemies
Build 150 towers.
Earn 15 stars.
Build 100 towers.
Call all waves early in a single mission.
Train a hero up to max level.
Call 10 waves early.
Train a hero up to level 5.
Open 5 information cards.
Kill 500 enemies.
Build 30 towers.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.
Earn 45 stars.
Sell 30 towers.
Polymorph 50 enemies into sheep.
Hold 500 or more enemies with Wrath of the Forest.
Drop 1.000 or more bomblets with the cluster bomb.
Summon 5 rock elementals in any one stage.
Kill 50 enemies by poison damage.
Shoot 100 missiles.
Snipe 50 enemies.
Kill 10 or more sheep with your hands.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the elusive acorn.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 9 legions before they replicate.
Defeat Moloch the Demon Overlord.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Find the ninja master rat.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.