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