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