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