Here is the full list of all 58 Paladins achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Play 100 matches while in a party.
Spend over 100,000 Credits in the item store over all your matches
100 Double Kills
Kill an enemy player from over 300 units away.
Die to an environmental hazard.
5 Champions at Mastery 5.
6 Champions at Mastery 5.
7 Champions at Mastery 5.
8 Champions at Mastery 5.
9 Champions at Mastery 5.
10 Champions at Mastery 5.
4 Champions at Mastery 5.
Unlock 100 Cards.
Play 10 hours with a player from your friends list in your party.
3 Champions at Mastery 5.
Build your own custom loadout
50 Double Kills.
Reach a 20 kill streak in a match
2 Champions at Mastery 5.
Unlock Ranked
Kill an enemy player who is on a 15 killstreak or higher.
Kill a player in the air who is over 100 units above the ground.
Get a killing blow after the round has ended.
Deal more than 100,000 damage during a match.
Kill an enemy player while you are at or below 50 Health.
Kill a player with an environmental hazard.
Have a Paladins account over 1 year old
1 Champion at Mastery 5.
Play 50 matches while in a party.
Land 5 headshots in a row without missing.
Deal damage to every enemy champion in a match before any of them damage you.
Play 5 hours with a player from your friends list in your party.
10 Double Kills.
Play 20 matches while in a party.
Play 10 matches while in a party.
Kill more than 20 enemy champions in a single match.
Win a match where the enemy team scored no points.
Survive more than 50 battles with less than 10% health.
Play a match while in a party.
Kill an enemy champion after they had already killed you.
Complete the Paladins Tutorial.
200 Double Kills.
400 Double Kills.
Play 25 hours with a player from your friends list in your party.
Play 100 hours with a player from your friends list in your party.
Play 250 hours with a player from your friends list in your party.
Reach level 30 during the Paladins Beta.
Be the only player alive in a match.
Shield over 200,000 damage in a match
Heal over 100,000 health in a match
Get a daily reward 7 days in a row
Play over 300 matches
Earn over 500,000 Gold over your play history
Earn over 1,000,000 Gold over your play history
Reach Master in Ranked
Have over 30 different champions at mastery level 10 or higher
Have over 30 different champions at mastery level 15 or higher
Have over 30 different champions at mastery level 20 or higher