Here is the full list of all 43 Razenroth achievements.
Drink 50 potions
Kill 1000 monsters
Unlock Skeletor
Kill Evil Tree
Open 15 chests
Kill Spectre
Buy new thing for the hut
Destroy 500 environment elements
Collect 200 pieces of gold
Find Phoenix altar
Unlock Fire elemental
Kill Flameclaw
Kill Swamp Thing
Kill 500 monsters
Kill 5 mini bosses
Kill Goblin Sapper
Kill Meat Monster
Complete the game on any difficulty
Unlock grandpa
Open 5 chests
Kill Wind Titan
Kill Shaman
Buy 1 item
Destroy 100 environment elements
Kill 100 monsters
Kill Gruu
Destroy 50 environment elements
Kill Mud Monster
Kill Ro'gnar
Complete the game on hard difficulty level
Complete the game on hell difficulty level
Kill 20 mini bosses
Buy all available things for the hut
Complete 5 quests
Find magic apple
Unlock golem
Unlock Treant
Collect 500 pieces of gold
Collect 1000 pieces of gold
Open 30 chests
Buy 20 items
Buy 50 items
Kill Killer Plant